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S Salmon patch / Nevus simplex Etiology : vasomotor immaturity Appearance : pink to red blanchable patches Location : nape of neck, eyelids, glabella Tx : none Prog : fades within first 2 yrs of life To play, press and hold the enter key. To stop, release the enter key. Scabies Etiology : Sarcoptes scabiei Appearance : scattered pink papules, burrows, vesicles, and excoriations At risk : living in close quarters (dorms, nursing homes, homeless) Location : web spaces of fingers, umbilicus, belt line, groin, axillae Tx : 2 doses of permethrin given 10 days apart or with oral ivermectin 1/9 Scalded Skin Syndrome Etiology: Cause: S. Aureus (exfoliative toxin) Description: red rash with wrinkled tissue or paper-like consistency that typically starts on the face and flexural regions, then spreads rapidly to other parts of the body; bullae can form post-rash and easily rupture causing sloughing of the skin in large sheets At risk: <5 yo, RF immunosuppressed, DM Location: skin folds and then disseminates in 48 hrs Tx: burn unit/ICU, IV abx Scarlet fever / Second Disease Etiology: Cause: S. pyogenes (exotoxins A, B, C) Description: fine blanching rash post sore throat; “goose skin or sandpaper like” Sebaceous Hyperplasia Etiology: Appearance: skin-colored or yellowish umbilicated papules Vs. BCC – pearly, waxy with telangiectasia that will bleed or scab easily Prog: expect more in coming years Dermoscopy: “crown vessel” pattern with vessels that are blurry and restricted to the periphery Seborrheic Dermatitis Etiology: Appearance: erythematous patches with overlying scale; greasy yellow plaque with scale Location: scalp, eyebrows, eyelids, nasolabial folds, external auditory canal, central chest Tx: ketoconazole twice daily, desonide cream twice daily for 1-2 weeks, antidandruff shampoo Cause: increased activity of sebaceous glands due to presence of Malassezia Description: erythematous, well-demarcated plaques with greasy yellow scales in areas rich in sebaceous glands; worsens in winter and early spring; in darker skin, the plaques and scales can make the skin appear lighter Location: scalp, face, periocular Associated with: Parkinson’s Disease Hypopigmentation due to widespread SD Faint redness and scaling along creases of nose Slight scale Fine scaliness and redness along nose and cheeks Beard is common location for SD SD affecting eyelid The fold behind the ear is a common location for seborrheic dermatitis. SD common in ear canal Scale and erythema due to seborrhoeic dermattis on the glabella and brows Confluent erythema and scale due to scalp seborrhoeic dermatitis Flexural seborrhoeic dermatitis in the axilla Pigmented paranasal seborrhoeic dermatitis in skin of colour Seborrhoeic blepharitis and dermatitis on the cheeks Seborrhoeic dermatitis around the hair line and forehead in skin of colour Inflammatory infantile seborrhoeic dermatitis – note lesions in the body folds Thick yellow scale in crade cap Seborrheic Keratosis (SK) Etiology : mutations in FGFR3 genes At risk : > 30 yo Appearance : "stuck on" appearing warty plaque or patches Dermoscopy : moth eaten borders, keratin pseudocysts Tx : cryo (light skin), EDC (darker skin) Senile Purpura Etiology: steroids, blood thinners, poor nutritional status, fair skin, age Location : dorsal hands , forearms Tx : none 1/10 Sézary Syndrome Etiology: Cause: unknown Description: Lighter skin = diffuse red rash with pruritis and edema covering >80% of body. Darker skin = gray, purple or brown. Early symptoms of rash appears like eczema or psoriasis At risk: elderly 1/3 Sjögren-Larsson syndrome Etiology: Define: rare genetic disorder characterized by ichthyosis (scaly skin), intellectual disability, and spasticity Etiology: deficiency in fatty aldehyde dehydrogenase (FALDH), which is encoded by the ALDH3A2 gene Inheritance: AR Tx: leukotriene B4 Skin Tags / Acrochordons / Fibroepithelial Polyp Etiology: Cause: excess friction Description: smooth or slightly wrinkled, flesh-colored, or darker, and hanging off the skin by a small stalk Locations: areas of high friction: armpits, under breasts, groin, neck Associated with: obesity, diabetes, pregnancy, acromegaly To play, press and hold the enter key. To stop, release the enter key. Smallpox Etiology: Cause: smallpox virus Description: 1. after 2-4 days of fever, body aches and headache, a rash develops 2. rash becomes raised bumps that then become fluid-filled with a depression in the center (umbilicated) 3. bumps turn into pustules that are raised, round and firm to touch 4. after about 5 days pustules begin to form a crust and then scab 5. scabs fall off leaving marks on the skin that eventually become pitted scars Location: Rash spreads to face, arms, legs, hands and feet and to all parts of the body within 24 hours Solar Elastosis / Actinic Elastosis Etiology: Cause: chronic sun damage + smoking Description: dry, thick, and yellow skin, with bumps, wrinkles, or furrowing Solar Lentigo / Sun spot Etiology: Appearance: hyperpigmented macules and patches Tx: bleaching creams, LN, chemical peels, lasers Solitary (Juvenile) Xanthogranuloma (JXG) Etiology: Appearance: Histo: touton giant cells, lots of eos Spider angioma / Spider naevus / Spider telangiectasia Etiology: Cause: increased estrogen Description: spider webs or tree branches (arteriole) Associated with: liver cirrhosis + pregnancy Spitz nevus Etiology: Appearance: raised, dome-shaped mole, typically reddish or pinkish At risk: children + young adults Vs. melanoma due to appearance Splinter hemorrhages Etiology: Cause: S. aureus (mostly), S. viridans (anything that can increase IC deposition) Description: linear hemorrhage lesions Location: nail bed 1/6 Squamous Cell Carcinoma (SCC) Etiology : UV exposure over a lifetime Location : lower legs (women), chest/back (men) At risk : Fitzpatrick types I + II, smoking, arsenic exposure, immunosuppression, scars, tanning bed use, HPV infection Appearance : firm, skin to pink colored, infiltrative papule or plaque that is sometimes ulcerated or covered in crust Dermoscopy : focal scale, glomerular vessels, pinpoint hemorrhages, central keratin mass, hairpin vessels Tx : excision, Mohs, radiation or cryo in select cases Go to link Go to link Go to link Go to link Go to link Go to link Go to link Go to link Go to link 1/2 Stevens-Johnson Syndrome (SJS) / Toxic Epidermal Necrolysis (TEN) Etiology: Sx: fever, HA, rhinitis, and myalgias precede mucocutaneous lesions by 1-3 days; eruption initially symmetric and pain is a prominent symptom Location: face, upper trunk, proximal extemities Appearance: erythematous irregularly shaped, dusky red to purpuric macules with dark center which progressively coalesce; + Nikolsky sign SJS <10% TEN >30% Tx: stop drug, go to a burn unit, IVIG, IV CS Cause: type IV HS drug reaction Description: circular non-pruritic rash that is darker in the middle and lighter on the border; progresses to blisters and sores which are painful and easily peel Location: usually starts on the upper body before quickly spreading to the face, arms, legs, genitals + mucosal surfaces Associated with: TEN (SJS that covers >30% of body surface) Strawberry / Infantile Hemangioma Etiology : expresses higher levels of vasculogenic factors than normal tissue (VEGF) Appearance : well-defined bordered erythematous papules or nodules At risk : before 4 weeks of age Location : head + neck Tx : most are self resolving; if it is high risk (airway, liver, GI involvement, periorbital, PHACE syndrome, rapidly growing) then oral propranolol Prog : involution typically begins between 6-12 mo of age Stucco keratoses Etiology: Appearance: small white-gray SKs Location: dorsal feet/ankles At risk: older light-skin Tx: cryo, curettage, ED, Amlactin Sturge-Weber syndrome Etiology: Cause: somatic mosaicism of activating mutation in 1 copy of GNAQ gene Description: port-wine stain in trigeminal nerve territory Sweet Syndrome / Acute febrile neutrophilic dermatosis Etiology: Appearance: sudden onset of painful, red or purple, “juicy”, raised lesions (plaques, papules, or nodules) Sx: fever Ass. conditions: infections, IBD, + hematologic malignancies Tx: pred Cause: Description: erythematous, edematous, well-demarcated, tender plaques that are asymmetrically distributed Location: face, neck, + upper extremities Associated with: IBD 1/8 Swimmer’s Itch / Cercarial Dermatitis Etiology: Cause: Schistosoma mansoni Description: 1. occurs within hours of exposure after the film of water has dried on the skin 2. itch or a tingling sensation which settles quickly, leaving tiny red spots where skin penetration by the cercariae/larvae 3. Intense itch develops over hours and the red spots can enlarge to form papules and hives 4. Blisters may develop over the next 24 to 48 hours At risk: anyone swimming in waters with infested snails To play, press and hold the enter key. To stop, release the enter key. Syphilis Etiology: Treponema pallidum pallidum Appearance : primary = chancre (firm, painless, oozes fluid) secondary = maculopapular rash including palms + soles; condylomata lata (smooth, painless, warlike white lesions on genitals) tertiary = gumma Tx : penicillin tertiary syphilis tertiary syphilis secondary syphilis secondary syphilis secondary syphilis secondary syphilis secondary syphilis secondary syphilis secondary syphilis secondary syphilis secondary syphilis secondary syphilis secondary syphilis secondary syphilis secondary syphilis secondary syphilis secondary syphilis secondary syphilis secondary syphilis secondary syphilis secondary syphilis secondary syphilis primary syphilis primary syphilis primary syphilis primary syphilis primary syphilis primary syphilis primary syphilis Systemic Lupus Erythematosus (SLE) Etiology : systemic autoimmune condition Types/Appearance : Acute cutaneous LE : butterfly/malar rash that spares nasolabial folds Subacute cutaneous LE : annular scaly erythematous macules + plaques on head + extremities DLE : pink infiltrative scaly patches + plaques that heal with atrophy, depigmentation, scarring Tx : antimalarials, CS, immunosuppressants, dapsone discoid lupus discoid lupus discoid lupus discoid lupus discoid lupus discoid lupus discoid lupus discoid lupus acute SLE acute SLE acute SLE acute SLE acute SLE acute SLE subacute SLE subacute SLE subacute SLE subacute SLE subacute SLE chronic SLE chronic SLE chronic SLE Systemic Scleroderma (SSc) Etiology: Cause: autoimmune condition with noninflammatory vasculopathy and collagen deposition with fibrosis (anti-Scl-70 Ab, anti-RNA polymerase III Ab, anti-centromere Ab) Description: Limited SSc = only involving fingers and face = calcinosis cutis, Raynaud phenomenon, sclerodactyly, telangiectasia Diffuse SSc = widespread skin thickening, shiny appearance, feeling of tightness + visceral involvement; sometimes have a “salt and pepper” appearance on darker skin Syringoma Etiology: Define: benign skin growths that originate from sweat ducts Appearance: small, skin-colored or yellowish bumps Location: clustered around the eyes, but can also occur on neck, chest, abdomen, and genitals Cause: overgrowth of eccrine sweat glands Description: firm bump that resembles a pimple (papule) on your skin that usually forms in small clusters or groups on your skin Location: face (lower eyelid + upper cheeks) Ass: Down syndrome A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Welcome Welcome Welcome Welcome Welcome to DalyDermatology! 💖 Join me on my journey as a medical student exploring the science behind healthy, radiant skin—and working to make dermatology more inclusive for everyone. Inspired by the lack of diverse skin images in medical education, I created Daly’s Diverse Dermatology Dictionary: a free resource showing how skin conditions appear across all skin tones. My passion is to bridge gaps in knowledge, encourage equity, and help our medical community better serve every patient. Thanks for being here—let’s learn and grow together! ✨ Check out my most recent blogs! Derm Dream Bag: My Dermatology Audition Rotation Essentials Discover the ultimate dermatology audition bag essentials! From pink Vaseline and L’Oréal lip gloss to study guides, sunscreen, meds, and snacks—this tote is packed for a busy med student’s clinic day. Stay prepped, polished, and confident with these must-haves in your Poppy & Peonies tote. Fern-tastic Protection? How Fern Extract Might Help Prevent Sunburns Did you know fern extract might help protect your skin from the sun? 🌿 Polypodium leucotomos, a tropical fern, has shown promise in reducing sunburn severity and UV damage. While it’s not a sunscreen replacement, it could be a powerful supplement in your sun-protection routine. Science and nature, teaming up for better skin! ☀️ The Day Before Step 2 CK: My Rituals, Mindset, and Must-Do’s for Success Curious how I prep the day before Step 2 CK? From early-morning Anki to my superstitious Olive Garden dinner, I share my rituals, mindset, and self-care strategies that help me stay calm, focused, and ready to conquer exam day. Discover my step-by-step routine and tips for setting yourself up for success! Bridging the Gap: Daly's Diverse Dermatology Dictionary After realizing most dermatology images in my training only showed conditions on white skin, I began collecting and organizing photos of skin diseases across all skin tones. This project grew into Daly’s Diverse Dermatology Dictionary—a free, ever-expanding resource designed to fill this gap and help students, clinicians, and educators recognize skin diseases on every patient. My goal is to make dermatology education more inclusive, accurate, and truly reflective of the diversity in our world, so we can provide better, more equitable care for all. Click Here Follow me on Instagram @dalyderm Load more

P Paget disease Etiology: Cause: DCIS Description: erythematous, pruritic, ulcerated skin at the nipple and breast Palmoplantar Verruca Etiology: Appearance: thick, endophytic papules Papillary Hidradenoma / Hidradenoma Papilliferum Etiology: Cause: unknown cause; thought to arise from anogenital mammary-like glands Description: slow-growing painless, firm, flesh to red nodule Location: labia majora + interlabial folds Papillon-Lefure Syndrome Etiology: Appearance: hyperhidrosis + periodontitis with severe gingivitis Inheritance: AR Peau d’orange Etiology: Cause: blockage of lymphatic drainage with or without associated stromal infiltration; inflammatory breast cancer Description: thick and pitted, with a texture and appearance similar to that of orange peel Pemphigoid Gestationis / Herpes Gestationis Etiology : IgG autoantibodies that target BP180 Appearance : erythematous papules or plaque around the umbilicus + then spreads to most areas of body, but sparing face + mucous membranes; 2-4 weeks later large, tense bullae form Sx : intensely itchy Tx : high potency topical CS, but many end up requiring oral CS Risk to fetus = prematurity Pemphigus Foliaceus Etiology : IgG autoantibodies to desmoglein 1 At risk : Tunisia Appearance : flaccid, superficial bullae that rupture easily Location : seb derm distribution (NO oral lesions) Tx : systemic CS Pemphigus Vegetans Locations : Intertriginous Pemphigus Vulgaris Etiology : IgG autoantibodies to desmoglein-1 and/or desmoglein-3; can be triggered by meds (#1 captopril + penicillamine) Location : mucosal membrane + skin Appearance : flaccid bullae that easily rupture (+ Nikolsky sign; + Asboe-Hansen sign) Sx : extremely painful At risk : middle aged to young adults ; Ashkenazi Jews Tx : systemic CS Periorificial Dermatitis Etiology: Tx: taper steroids, oral tetracycline, topical metronidazole, erythromycin, tacrolimus Petechiae Etiology: Description: Tiny 1-2 mm, initially purpuric, non-blanchable macules resulting from tiny hemorrhages Peutz-Jeghers Syndrome (PJS) Etiology: Cause: autosomal dominant condition with mutations in serine/threonine kinase 11 (STK11) Description: Tan, dark brown, or bluish black flat patches 1 to 5 mm in size Location: around the mouth, lips, gums, inner lining of the mouth, eyes, hands and feet, fingers and toes, anus and genital areas Associated with: GI polyps Piebaldism Etiology: Define: rare, inherited genetic disorder characterized by patches of skin and hair that lack pigment Cause: AD mutation inactivating c-KIT gene Description: white forelock with white patches of skin Location: face (chin), trunk, + distal extremities Pigmentary Demarcation Line Etiology: Define: abrupt transition between areas of darker and lighter pigmentation At risk: darker skin tones Pigmented DFSP (Bednar tumor) Etiology: At risk: AA Pigmented Purpuric Dermatosis (PPD) Etiology: Appearance: reddish-brown patches and spots Etiology: results from capillary inflammation and leakage of red blood cells, leading to hemosiderin deposits Location: lower legs Tx: topical corticosteroids, compression stockings Pilar Cyst / Trichilemmal Cyst Etiology: Cause: keratin-filled cyst that originates from the outer hair root sheath; typically running in families (AD) Description: one or more firm, mobile, subcutaneous nodules measuring 0.5 to 5 cm in diameter and without a central punctum Location: typically scalp Pilomatricoma Etiology: Define: benign (non-cancerous) skin tumor that arises from hair follicle cells Appearance: small, hard, and slow-growing lump Location: head or neck Pityriasis Alba Etiology: Cause: unknown; coexists with dry skin and atopic dermatitis Description: hypopigmented patches that are round or irregular in shape and up to 5 cm in diameter Locations: typically appear on face, especially cheeks and chin Pityriasis Lichenoids Et Varioliformis (PLEVA) Etiology: Pityriasis Rosea Etiology : not clear; some suggest HHV-6 or 7 At risk : older children + young adults Appearance: begins with a single "herald patch" or "mother patch" which is a salmon colored oval plaque, usually on neck, back or chest. Patch becomes scaly and develops central clearing, forming "collarettes of scale." Then numerous similar but smaller patches. appear on trunk + extremities following skin tension lines (Christmas tree distribution). Tx : only topical CS to relieve pruritus Pityriasis (Tinea) Versicolor Etiology : Malassezia furfur or Malassezia globosa Appearance : hyper or hypo pigmented or salmon colored scaly patches Location : sebum rich areas Tx : selenium sulfide, ketoconazole shampoo, topical or oral azoles Pitysporum Folliculitis Etiology: Dermatoscope: spores grouped together in hair follicle POEMS Syndrome Etiology: Description: hyperpigmentation, hemangiomas, hypertrichosis, and scleroderma-like skin thickening Polyarteritis Nodosa (PAN) Etiology: Cause: Medium vessel vasculitis Description: lace like rash (livedo reticularis) + ischemic digits Associated with: HBV, acute mesenteric ischemia Polymorphic Eruption of Pregnancy (PEP) / Pruritic Urticarial Papules and Plaques of Pregnancy (PUPPP) Etiology: Sx: onset of late 3rd trimester Location: starts within abdominal striae with periumbilical sparing RF: primigravid preg, multiple gestation preg Does not affect development Tx: topical steroids, non-sedating oral antihistamines, oral pred Polymorphous Light Eruption (PMLE) Etiology: Appearance: erythematous papules, vesicles, plaque on sun exposed skin only Tx: antihistamines (Zyrtec and Benadryl), steroid injection in office Cause: stretching of the skin elicits an immune response due to connective tissue damage Description: itchy, bumpy rash that starts in the stretch marks of the abdomen Porphyria Cutanea Tarda Etiology: Cause: AD mutation in UROD gene = affecting uroporphyrinogen decarboxylase = accumulates uroporphyrin Description: blistering cutaneous photosensitivity and pigmentation Port-wine stain / Nevus flammeus Etiology : vascular malformation of capillaries and post capillary venules in dermis Appearance : pink, red, or violaceous sharply demarcated patches that darken + thicken overtime Location : face, unilateral Tx : PDL Prog : persist throughout life + grow proportionally with child Pretibial myxedema / thyroid dermopathy Etiology: Cause: dermal fibroblasts Description: plaques of thick, scaly skin and swelling Location: lower legs Associated with: Graves disease (hyperthyroidism); if not at pretibial region = related to hypothyroidism Primary Cutaneous Anaplastic Large Cell Lymphoma (ALCL) Etiology: Cause: t(2;5)(p23;q35) translocation resulting in a fusion gene product of receptor tyrosine kinase ALK with nucleophosmin Description: rapidly-growing single nodule or plaque that typically is red to violaceous, at least 2 cm in diameter, and often ulcerates Location: upper half of the body is most commonly involved At risk: 50+ yo males Proteus syndrome Etiology : mosaic non inherited mutation in AKT1 gene Appearance : port wine stains Location : limbs, digit, skull Prog : at risk for developing DVTs, PEs Prurigo Nodularis Etiology: Sx: intensely itchy, firm nodules; can be extremely uncomfortable, impacting sleep and potentially leading to anxiety and depression Tx: JAK-I, ILK Pseudofolliculitis Barbae / Razor Bumps Etiology: Cause: shaving, which lead to ingrown hair Description: firm, hyperpigmented papules and pustules that are painful and pruritic Location: face + neck At risk: Black males Psoriasis Etiology: Appearance: well demarcated pink erythematous plaque with silver scale Nail changes: pitting, onycholysis, subungal hyperkeratosis, oil drop sign (yellow-orange discoloration) Tx: localized: high potency steroid +/- topical vitamin D other options: tazarotene, calcineurin inhibitors, Taltz, Otezla (apremilast) Cause: T cells triggered (stress, skin injury, infection, cold, dry weather, tobacco) to attack skin cells Description: dry, raised skin patches (plaques) covered with gray or silver scales Location: hairline, elbows, knees (extensor surfaces) Purpura Etiology: Description: 4 - 10 mm in diameter, flat, and red, purple in color Pustular Psoriasis Etiology: Sx: presents in 3rd trimester Appearamce: symmetric erythematous plaques with pustules that start in flexural areas and spread centrifugally Location: trunk and extremities Ass sx: fever, malaise, nausea, vomiting, anorexia Tx: CCS, low dose cyclosporine, infliximab Prog: increased risk to fetus Cause: triggers from infections, stress, corticosteroid treatment withdrawal, and pregnancy Description: pus-filled blisters on plaques, which are patches of scaly, flaky skin Pyoderma Gangrenosum Etiology: Description: painful, symmetrical necrotic base that progresses over 1 month Location: legs Associated with: IBD Pyogenic granuloma / Capillary lobular hemangioma Etiology : mutation in BRAF plays a key role; medications (retinoids, TK inhibitors), trauma, laser therapy At risk : 20-30 yo Appearance : small red papule that grows over several weeks into a nodule Location : hands, lower lip, gingiva Tx : full thickness excision or shave excision for pedunculated lesions A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

L Lamellar Ichthyosis Etiology: Define: rare, inherited skin disorder characterized by the abnormal formation and shedding of skin cells, leading to thick, scale-like patches on the skin's surface Appearance: born with a tight, shiny, and waxy collodion membrane, which peels off within the first few weeks, revealing large, dark, plate-like scales on the skin (fish-like scales) Locations: legs + skin folds (neck + armpits) Langerhans Cell Histiocytosis Etiology: Histo: lots of edema, eos (Reniform, kidney bean shaped grooved nuclei) Stains: S100+, CD1a+, Langerin+ (forms birbeck granules) Linear IgA Bullous Dermatitis (LABD) Tx: Dapsone Lentigo Etiology: Cause: sun exposure and aging Description: Irregular-shaped tan or brown patches on the skin, usually with well-defined edges; surface can be either smooth or rough Lentigo Maligna Etiology: Define: type of melanoma in situ characterized by slow-growing, flat, discolored patches of skin Location: face, neck, and arms Appearance: irregular patches that can be brown, dark brown, pink, red, white, or blue At risk: 70+ yo Tx: MOHs Lentigo Simplex Etiology: Appearance: flat, brown or black spots Tx: cryotherapy, lasers, chemical peels, and topical retinoids and hydroquinone Leprosy / Hansen Disease Etiology : Mycobacterium leprae complex Types/Appearance: Paucibacillary/Tuberculoid Hansen disease = < 5 lesions = hypo or hyperpigmented macules with loss of sensation Multibacillary/Lepromatous Hansen disease = 6+ lesions = diffuse, symmetrical, infiltrative skin papules + plaques with dermal thickening; not always loss of sensation At risk : immigrants, exposure to armadillos Tx : PB = dapsone + rifampin for 12 mo; MB = dapsone + rifampin + clofazimine for 24 mo Leser-Trélat sign Etiology: Description: explosive onset of multiple seborrheic keratoses (pigmented skin lesions), often with an inflammatory base Associated with: gastric adenocarcinoma Letterer-Siwe Disease Etiology: Cause: unknown cause, but the number of Langerhans cells in the skin and other organs are triggered to increase (type of Langerhans cell histiocytosis); BRAF V600E mutation associated Description: small pinkish papules or blisters that may be crusted or infected (appears like seborrheic dermatitis) At risk: <2 yo Location: scalp, neck, armpits, groin, and trunk Leukocytoclastic Vasculitis / hypersensitivity vasculitis / hypersensitivity angiitis Etiology: Cause: allergic reaction to drugs, Streptococcal URTI, infection from HBV, HCV, S. aureus, mycobacterium, and autoimmune disorders (RA, SS, SLE, HSP) Description: grouped rash on legs that include pustules, nodules, and mottling Leukonychia Etiology: Cause: trauma, chemotherapy, arsenic poisoning, hypoalbuminemia (Muehrcke lines), systemic disease (Terry nails) Description: partial or full opacification of the nail plate Lichen Planus Etiology: Cause: Associated with HCV Description: pruritic, purple, polygonal planar papules and plaques Locations: typically, wrists and ankles Lichen Sclerosus Etiology: Cause: progressive inflammatory disease Description: parchment-like atrophic area that is thinner and more white Associate with: SCC Lichen Simplex Chronicus / Neurodermatitis Etiology: Cause: hyperplasia of vulvar squamous epithelium Description: leathery, thick vulvar skin that is itchy Lichen Spinulosus Etiology: Lichenoid keratosis (BLK) Etiology: Appearance: single, small, pink or reddish papule or plaque; can appear as a wart-like growth or a scaly, dry patch; shiny at first, take an alcohol wipe, will be dull appearance afterwards Vs. BCC will still be shiny afterwards Locations: trunk and upper extremities Tx: cryo, EDC Cause: unknown cause, but triggers include minor trauma such as friction, drugs, dermatitis, and sun exposure Description: single small gray-brown or inflamed plaque or papule Location: chest + upper extremities Lichtenberg Figures Etiology: Cause: Lightning strike injury Description: transient pink-red fractal pattern marks on the skin Lipodermatosclerosis Etiology: bottle necking Livedo Reticularis Etiology: Cause: many causes, including cold exposure and chronic medical conditions (SLE, Cold AIHA, etc.) Description: bluish-red, lace-like pattern Localized Scleroderma (morphea) Etiology: Cause: unknown Description: 1. active stage = inflammatory erythematous plaque 2. sclerosis stage = yellow-ivory lesion 3. atrophy = cigarette-like paper Associated with: other autoimmune conditions Lupus Miliaris Disseminated Faciei Etiology: Histo: small pea like palisading granuloma with central casseous necrosis Lupus pernio Etiology: Cause: Sarcoidosis Description: blue red to violet smooth shiny nodules + plaques Location: head + neck, especially nose, ears, lips, cheeks At risk: African American females Lyme Disease / Erythema Migrans Etiology: Cause: Borrelia burgdorferi (via Ixodes deer tick) Description: bull’s eye configuration that typicaly appears 7–14 days (range 3–33 days) after the infected tick bite At risk: living in the northeast Lymphangioma circumscriptum Etiology: Description: small, firm, translucent vesicles Location: axillary folds, shoulders, neck, proximal limbs + buccal mucosa Lymphangitis Etiology: Cause: acute streptococcal infection of the skin Description: Tender red streaks often radiate from the wound toward the nearest lymph glands Lymphogranuloma venereum Etiology: Cause: C. trachomatis (L1-L3) Description: infection of lymphatics presenting with painless genital ulcers and painful inguinal lymphadenopathy Associated with: penile SCC A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

C Café Au Lait Appearance : well-demarcated hyperpigmented oval or round shaped patch, pigment is evenly distributed Ass. with : Neurofibromatosis, McCune-Albright syndrome, Fanconi Anemia Tx : lasers Calciphylaxis Etiology: necrosis of skin + fatty tissue, typically in ESRD pts; can occur in those with high or normal levels of serum calcium + phosphate At risk : females, obesity, immunosuppressed Appearance : - begins as surface purple retiform purpura - then turns black in the center as a stellate shaped purpura then turns into dry gangrene + ulcerates Tx : normalize calcium + phosphate levels associated with renal failure; IV infusions of sodium thiosulfate Go to link Go to link Go to link Go to link Go to link Go to link Go to link Go to link 1/2 Candidal Diaper Dermatitis Etiology : Candida albicans Appearance : erythematous plaques with peripheral scaling + satellite papules or pustules Locations : warm, moist areas Tx : clotrimazole cream Carbuncle Etiology : multiple bacterial folliculitis (furuncles/boils); typically S. aureus - mnemonic: "multiple furuncles fit in a CAR" Appearance : erythematous pustules surrounding a hair follicle Ass. with : Neurofibromatosis, McCune-Albright syndrome, Fanconi Anemia Tx : antibacterial soap, oral abx Carney Complex Etiology : inactivating mutation in PRKAR1A Inheritance : AD Appearance : hyperpigmented macules Location : labial, perioral, periorbital, anogenital Ass. with : cardiac myxoma, skin myxomas, lentiginosis, pituitary adenomas, testicular tumors, primary pigmented nodular adrenocortical disease 1/7 Carrión Disease (Verruga peruana / Peruvian wart) Etiology : Bartonella bacilliformis At risk : South Americans Appearance : eruption of red to purple nodules Tx : abx Cat Scratch Disease Etiology : Bartonella henselae Appearance : erythematous papules + nodules with regional lymphadenopathy At risk : owning cats <12 mo old, licked/bitten/scratched by cat, immunocompromised Tx : self limiting or azithromycin for severe/persistent sx Cellulitis Etiology : S. pyogenes , S. aureus (often from a break in skin from trauma, infix , or recent surgery) Appearance : poorly-demarcated erythematous edematous plaque; typically unilateral At risk : middle age + older Location : lower extremities Tx : oral cephalexin or IV cefazolin Central Centrifugal Cicatricial Alopecia (CCCA) MC scarring hair loss Etiology : unknown, multifactorial At risk : African American females Location : vertex, frontal hair line Appearance : shiny scalp with follicular dropout Common sx : itchy scalp, burning sensation Tx : topical or intralesional CS, tacrolimus, Doxy Chancroid Etiology : H. ducreyi Appearance : one or more erythematous papules that quickly evolve into pustules and become larger until they break down into an ulcer Sx : extremely painful ulcer that bleeds easily Tx : azithromycin 1/4 Cherry Angioma Etiology : aging; sometimes associated with somatic missense mutations in GNAQ and GNA11 (Q209H) genes Appearance : erythematous to blue or purple papule or nodule Location : trunk Tx : ED, laser, cryo, shave excision Chickenpox Etiology : VZV Appearance : erythematous papules + vesicles in different stages (crust vs vesicle) Location : begins on trunk and spreads to face + extremities Tx : in children is self limited; in older children + adults acyclovir is recommended; VZIG for pregnant women Chillblains Etiology : tender and/or itchy bumps following exposure to damp, cold, non-freezing conditions causing constriction of small arteries and veins but a protective reflex intermittently dilates At risk : young to middle-aged adults, females Location : hands, feet, ears Tx : avoid cold, wet temps, topical nitroglycerine Prog : spontaneously regress in 1-3 weeks Chloasma / Melasma Etiology : overproduction of melanin by melanocytes; triggered by sun exposure, hormones, medications, ass. with family hx Appearance : light-to-dark brown macules or patches with irregular borders Location : bilateral cheeks At risk : pregnancy, females Tx : hydroquinone , tretinoin Chromoblastomycosis Etiology : chronic fungal infection; #1 fungus = Fonsecaea pedrosoi Appearance : papules + plaque that spread to surrounding tissue with a cauliflower appearance Location : limbs At risk : tropics; middle aged men Associated with : SCC Coccidiomycosis / Valley Fever Etiology : allergic reaction to Coccidioides immitis Appearance : erythema nodosum or erythema multiforme 1/5 Collodion baby Define : newborn whose entire body is covered in tight, translucent membrane that resembles collodion Inheritance : AR Appearance : shiny, parchment-like membrane Tx : high-humidity incubator, emollients Comedones: Open + Closed Etiology : cells lining the sebaceous duct proliferate and there is increased sebum production causing debris blockage of the sebaceous duct and hair follicle Appearance : open = grey, brown, black papules; keratinous contents can be expressed closed = skin colored papules Tx : benzoyl peroxide, azelaic acid, salicylic acid, tretinoin, adapelene Closed comedones Closed comedones Closed comedones Closed comedones Open comedones Open comedones Open comedones Condyloma Accuminata / Anogenital warts Etiology : low risk HPV strains (6,11) Appearance : soft tan-colored, cauliflower-like papules Location : anus or genitals Tx : cryo, podophyllin resin, trichloroacetic acid, electrosurgery Congenital Dermal Melanocytosis / Mongolian spots Etiology : entrapment of melanocytes in the dermis of developing embryo Appearance : blue-grey patches At risk : East Asians, Polynesians Location : shoulder, gluteal regions Prog : typically regress by puberty Tx : none Conradi-Hünermann-Happle syndrome Characterized by : skeletal abnormalities, skin lesions following Blaschko's lines, cataracts Inheritance : XLD (females>) Appearance : linear or whorled hyperkeratotic scales following the lines of Blaschko, follicular atrophoderma, pigmentary changes, and sometimes pustular lesions Cowden Syndrome Etiology : mutation in PTEN Inheritance : AD Appearance : skin colored to yellow-brown, flat topped warty papules Location : central face surrounding eyes, nose, mouth Tx : 5-FU, oral retinoids To play, press and hold the enter key. To stop, release the enter key. Crusted Scabies / Norwegian Scabies Etiology : Sarcoptes scabiei var hominis Appearance : poorly defined erythematous patches that develop into thick scaly plaques At risk : immunocompromised, elderly, disabled or debilitated, HIV patients Location : between the fingers, under the nails, or diffusely over palms and soles, knees, and elbows Tx : oral ivermectin, topical insecticides Cushing Disease Etiology : increased ACTH = increased cortisol = decreased collagen synthesis = BV rupture easier Appearance : purple striae (stretch marks) Location : abdomen Cutaneous Anthrax Etiology : Bacillus anthracis Appearance : papule with surrounding vesicles that progress to an ulcer with black eschar Sx : painless Tx : doxy at diagnosis 6 days after dx 4 weeks after dx Cutaneous Horn Etiology : underlying lesions are seborrheic keratosis, viral warts (due to HPV), actinic keratosis, or well-differentiated SCC (50/50 benign vs premalignant or malignant) Appearance : straight or curved, hard, yellow-brown projection from the skin At risk : 60+ yo Location : sun-exposed areas Tx : excise Go to link Go to link Go to link Go to link Go to link Go to link Go to link Go to link Go to link 1/3 Cutaneous Larva Migrans Etiology : A. duodenale + N. americanus Appearance : erythematous serpiginous plaque At risk : barefoot on the beach, children in sandpits, farmers Tx : hookworms will die on their own in 4-8 weeks or can prescribe thiabendazole Cutaneous Leishmaniasis Etiology : Leishmania Appearance : initial lesion appears 2 weeks - 2 mo after sandfly bite and is a small red papule, which gradually enlarges up to 2 cm in diameter and forms an ulcerated nodule with raised border (volcano sign) Location : exposed skin, esp. face + extremities At risk : living or traveling through areas where sandflies and Leishmania species are endemic Cutaneous Neurofibroma Etiology : can be caused by NF1 gene mutation Inheritance : AD Appearance : circumscribed, soft button-like brown, pink, or skin colored nodules with a soft or firm consistency Location : trunk Tx : no cure; selumetinib may offer hope in reducing the size of plexiform neurofibromas 1/10 Cutis marmorata Etiology : superficial blood vessels dilate and contract at the same time Appearance : pinkish blue mottled or marbled appearance when subjected to cold temperatures At risk : children Prog : improves with age Cylindroma Etiology : mutation of CYLD gene that forms benign tumors of eccrine sweat glands Inheritance : AD Appearance : firm, rubbery, pink to bluish plaques and nodules Cysticercosis Etiology : Taenia solium Appearance : soft to firm, skin-colored nodules Sx : painful Location : trunk + extremities A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

D Darier Disease / Keratosis Follicularis Etiology: mutation of ATP2A2 gene Inheritance : AD Appearance : greasy plaque (SD-like); alternating red + white nail beds with V-shaped nicking Location : chest + back At risk : adolescents Tx: moisturizers, topical retinoids, sun protection Dermatitis Herpetiformis Etiology: cross-reactivity between anti-gliadin IgA antibodies + transglutaminase at the dermal basement membrane Appearance : erythematous vesicles and plaque that coalesce Location : elbows, dorsal forearms, knees, scalp, buttocks Sx : intense itching At risk : pts with Celiac Disease, Irish or Swedish patients Tx : gluten free diet, dapsone Dermatofibroma Etiology : trauma (mosquito bite, shaving nick) Appearance : tan to pink, firm, hyperpigmented dome-shaped papules with peripheral rim of darkening pigment Location : extremities Prog : once you get one, you're at risk of getting more Dermoscopy : peripheral fine network, central white or pink scar-like area, ring-like globules, dotted vessels At risk : adults Test : "dimple or pinch" sign Dermatofibrosarcoma protuberans Etiology : rare type of skin cancer characterized by its slow-growing, locally aggressive nature; unknown cause, but an injury is a predisposing factor Appearance : skin colored, pink or brown irregular border multi nodular fungating mass Sx : painless plaque +/- nodules that feels rubbery or firm to touch At risk : adults between 20- 60 yo Location : trunk Tx : wide excise, MOHs To play, press and hold the enter key. To stop, release the enter key. Dermatographia Etiology : skin trauma may release an antigen that reacts with the membrane bound IgE on mast cells triggering histamine release Appearance : linear wheals + a surrounding erythematous flare which appears 1-3 minutes after stroking + resolves in 30-60 minutes 1/7 Dermatomyositis Etiology : unknown; classic model considers DM to be the result of a humoral attack against the endothelium of muscle capillaries + small arterioles; risk factors include underlying malignancy + family hx of autoimmune disease At risk : 30-50 yo Sx : rash appears weeks to months before proximal muscle weakness Locations: extensor surfaces of MCP + IP = Gottron papules upper eyelids = Heliotrope malar-like rash chest = V neck sign = Poikiloderma upper back = Shawl sign lateral thigh = Holster sign Tx : systemic CS Go to link Go to link Go to link Go to link Go to link Go to link Go to link Go to link Go to link 1/3 Dermatophytosis / Tinea / Ringworm Etiology: Trichophyton, Epidermophyton, Microsporum Appearance : annular erythematous plaque with central clearing Locations: tinea barbae = beard tine a c apitis = head tinea corporas = body tinea cruris = groin tinia unguium = nails tine a pedis = foot At risk : hot humid climates Tx : topical antifungals unless if it is on head or nails (oral instead) Dermatosis Papulosa Nigra Etiology : activating mutation in FGFR3 Appearance : hyperpigmented brown-black sessile to filiform, smooth surfaced papules Location : cheeks, temples At risk : darker skin tones, females Tx : EDC (darker skin), cryo (lighter skin) 1/10 Diffuse Palmoplantar Keratoderma (DPK) Etiology: Appearance : hyperkeratosis with white/yellow hue Location : symmetric palmar + plantar surfaces Disseminated superficial actinic porokeratosis (DSAP) Etiology: autosomal dominant mutation in: MVD, MVK, FDPS, PMVK or SART3 genes; results in decreased cholesterol in the affected areas of the skin At risk : European, females Locations: arms, legs Appearance : irregular annular plaque with elevated horny rim Tx : compounded off-label topical 2% lovastatin with or without topical cholesterol Drug Reaction with Eosinophilia and Systemic Symptoms (DRESS) Etiology: delayed type IV HS reaction to certain medication ( anti epileptics , allopurinol, sulfonamides, minocycline, HIV meds) Appearance : facial edema, diffuse erythematous macules + plaques that typically occur in 3rd week after starting a med or increasing dose Location : first involves face, upper trunk, UE, and then spreads to LE Dyshidrotic Eczema Etiology : unknown Location: palms, fingers, soles of feet Sx : itchy chronic, recurrent Appearance : fluid-filled vesicles that resolve after several weeks with scaling Tx : clobetasol + tacrolimus; severe = Dupixent Dyskeratosis Congenita (DC) Etiology : 14 different genes (DKC1 gene mutations on X chromosome); causing telomere shortening = premature aging Appearance : lacy reticular hyperpigmentation Location : upper chest, neck, nail atrophy, oral leukoplakia Tx : no cure; tx is aimed at maintaining bone marrow function as this is the major cause of death A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Z Zoon’s Balanitis Etiology: unknown, potentially from mild trauma or friction Appearance: red, shiny plaque Location: glans penis A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

R Raynaud’s Phenomenon Etiology: Description: vasospastic event where digits change from blue to white to red Associated with: Scleroderma (CREST), SLE, Cold AIHA Reticulohistiocytoma (Solitary Epithelioid Histiocytoma) Etiology: Appearance: solitary red to brown to yellow papule or nodule in adults Richner Hanhart Syndrome Etiology: Appearance: dendritis keratosis, painful hands Inheritance: AR Rocky mountain spotted fever (RMSF) Etiology: Cause: Dermacentor variabilis, Dermacentor andersoni, Rhipicephalus sanguineus Description: 1. nonblanching rash initially appearing as red macules 1-5 mm in size and pruritic 2. within days the macules become papules, petechiae, and ecchymoses 3. in 50% of cases, rash becomes hemorrhagic Location: begins on the ankles and wrists, then spreads to the palms and soles To play, press and hold the enter key. To stop, release the enter key. Rosai Dorfman Disease Etiology: Appearance: Histo: S100+ Rosacea Etiology: increased amount of Demodex in sebaceous follicles, UV radiation, triggers (spicy food, alcohol, stress, extreme temperatures) At risk : females, Northern European Location : central face Appearance : flushing, papules, pustules, telangiectasias Ass. conditions: hyper/hypothyroid Tx : topical metronidazole, lasers, azelaic acid, doxy Rhinophyma Papulopustular Rosacea Erythematotelangiectatic Rosacea Erythematotelangiectatic Rosacea Rhinophyma Papulopustular Rosacea Papulopustular Rosacea Erythematotelangiectatic and papulopustular rosacea on the cheeks Papular rosacea on the cheeks Rhinophyma and papular rosacea on the chin Papulopustular and ocular rosacea Rhinophyma Steroid induced papulopustular rosacea Swelling and papulopustules in steroid induced rosacea Rhinophyma showing swelling and sebeceous gland openings Steroid induced rosacea on the forehead Papulopustular rosacea on the cheeks Rose Gardener’s Disease / Sporotrichosis Etiology: Cause: Sporothrix schenkii Description: multiple inflammatory subcutaneous nodules in a linear fashion along the course of the lymphatic channels Roseola / Exanthema Subitum / Sixth Disease Etiology: Cause: HHV-6 / HHV-7 Description: red lacy appearance (spares face), rose-colored macule (post high fever) Rubella / German measles / 3 day measles Etiology: Cause: Rubella Description: fine, erythematous, blanchable rash Location: begin on the face and spreads down Rubeola / Measles Etiology: Cause: measles virus (paramyxovirus) Description: diffuse, blanchable, erythematous, maculopapular rash + blue-white Koplik spots on buccal mucosa Location: rash begins at head and moving down A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

G Genital Herpes Etiology: HSV2 Appearance : vesicles sitting on erythematous base; "dew drops on a rose petal appearance" Treatment : acyclovir 1/9 Giant cell fibroblastoma Etiology: pediatric variant of DFSP History: pseudo vascular spaces, hypocellular spindle cells with myxoid background At risk: < 5 yo Location: thigh, groin, trunk Tx: wide excision, MOHs 1/2 Giant cell tumor of tendon sheath Location: hands, digits Histo : multi nodule oval shaped, darker in color, giant cells ("chocolate chip cookies with extra chips and a ring of pink around it"); hyper cellular; pools of free floating mononuclear histiocytoid tumor cells that can form a halo of hemosiderin around it Giant condyloma acuminatum (GCA) / Buschke-Löwenstein tumor Etiology: HPV 6,11 Appearance: slow-growing, cauliflower-like warty tumor with cobblestone surface Giant Congenital Melanocytic Nevus / Bathing Trunk Nevus Etiology : a proliferation of benign melanocytes that are present at birth or develop shortly after birth Appearance : >20 cm Prog : lifetime 5-10% risk of melanoma Giant Molluscum Contagiosum Etiology: At risk: HIV, immunocompromised Appearance: dome-shaped, flesh-colored papules with a central indentation; >10-15 mm Location: trunk, armpits, and genital area Tx: cryotherapy, curettage, laser therapy, topical cantharidin, tretinoin, or podophyllotoxin Prog: Most cases resolve on their own within months to a couple of years Gianotti-Crosti Syndrome / Infantile Papular Acrodermatitis Etiology: Cause: reaction to a systemic viral infection (URI or GI); #1 virus = EBV Description: papules 5–10 mm in diameter and are a deep red color Location: develops first on the thighs and buttocks, then on the outer aspects of the arms, and finally on the face At risk: children between the ages of 6 months and 12 years Glomus tumor / glomangioma Etiology: Gorlin Syndrome / Nevoid Basal Cell Carcinoma (NBCCS) Etiology: Define: prone to developing multiple BCCs, often starting in adolescence or early adulthood Inheritance: AD Appearance: flesh-colored or reddish-brown spots to pearly or shiny bumps Cause: AD mutation to patched (PTCH) gene C9q Description: skin tags + skin cysts (blue nevi) on face + body with multiple basal cell carcinomas multiple BCCs multiple BCCs pits over soles palmar pits palmar pits multiple BCCs and scars palmar pits Graft vs Host Disease Etiology: Cause: transplant rejection where immunocompetent T cells reject host cells with "foreign" proteins Description: mild rash may be slightly sore or itchy and look like a minor sunburn Granuloma Annularae Etiology: Appearance: violasceous annular plaque with scale Sx: itchy Histo: surrounded by lots of mucin vs. tinea (no scale) Tx: Rinvoq, UVB, Niacinamide, Zoryve Go to link Go to link Go to link Go to link Go to link Go to link Go to link Go to link Go to link 1/3 Granuloma Inguinale / Donovanosis Etiology: Cause: Klebsiella granulomatis Description: nodules that appear on genitalia or inguinal area that are painless, raised, beefy red, moist, smooth, and foul-smelling 1/3 Granulomatosis Infantiseptica Etiology: Cause: Listeria monocytogenes in neonates Description: pyogenic granulomas distributed over the whole body 1/2 Grey-Turner sign Etiology: Cause: retroperitoneal bleeding (kidney laceration) Description: ecchymosis on flanks 1/3 Grover Disease At risk: females Triggers: UV, sweat, heat Appearance: discrete vesicles with crust A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

X Xanthoma Etiology: disorders of lipid metabolism (dyslipidemia) or occur in histiocytosis Appearance : soft, yellow or skin colored papules or plaques Location/Types: medial canthus of upper eyelid = xanthelasma over pressure areas (knees, elbows, heels) = tuberous xanthoma extensor surfaces (buttock, shoulders) = eruptive xanthoma Xeroderma Pigmentosum (XP) Etiology: mutation in nucleotide excision repair (NER) Inheritance: AR Appearance : born with normal skin, but with increased sun exposure, patients develop hyperpigmented and hypo pigmented macules Location : sun exposed skin Prog : premature aging; die earlier from skin cancers Xerosis Cutis/Dry Skin Etiology: skin is lacking moisture in stratum corneum Appearance : rough, scaly plaque Go to link Go to link Go to link Go to link Go to link Go to link Go to link Go to link Go to link 1/2 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Q No conditions to list. A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

F Female Pattern Hair Loss Etiology: hereditary Appearance : widening of hair part; thinning, no shining of scalp Location : mid-frontal scalp Tx : topical minoxidil Fibrous Hamartoma of Infancy Etiology: benign tumor of the subcutis and lower dermis Histo: "ramen" waves - grey/blue ball cells = immature mesenchyme - mature fat that is honeycomb like At risk : < 2 yo Tx : excision Fixed Drug Eruption Etiology: drugs Appearance: - Early lesions: sharply demarcated erythematous macules - Late lesions: round or oval plaques that may evolve to become bullae and then erosions (occur 30 - 8 hours after ingesting drug) Location: mouth, genitalia, face, acral Prog: resolve days to weeks after drug is discontinued; PIH may persist Folliculitis Decalvans Etiology: considered to be the result of an abnormal immune response to S. aureus , although this is not yet proven Appearance: erythematous, swollen, and scaly patches and plaque with crust and pustules (like CCCA, but smaller and with pustules) Sx: itching, pain, and burning sensation Tx: clindamycin, CCS (topical + oral or injected) Focal Dermal Hypoplasia / Goltz Syndrome Etiology: rare genetic disorder affecting tissues derived from ectoderm and mesoderm Inheritance : XLD Location : mouth, genitals, anus Ass. conditions : coloboma, mission or webbed fingers Appearance : thin or absent skin areas, hypopigmentation, hyperpigmentation, and fat herniation; following Blaschko's lines; wart-like growth Frey's Syndrome Etiology: postoperative complication involving parasympathetic fibers regenerating on sympathetic fibers of sweat glands (auriculotemporal branch of V3 is cut during an excision of the parotid gland and reinnervates the skin sweat glands in front of the ear) Appearance : redness + sweating Location : preauricular Triggers : post-eating, thinking or dreaming about food 1/2 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z