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H Hailey Hailey Etiology: Halo nevus Etiology: Cause: unknown, but suspected to related to autoimmune in origin and triggered by sunburn or local trauma Description: white halo that surrounds a mole/nevus and is usually symmetrical and about 0.5–1.0 cm wide Location: most often trunk Hand Foot & Mouth Disease Etiology: Cause: Coxsackie A Description: vesicular rash Location: around the lips, mouth, and back of the throat 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 Hand-Foot Syndrome Etiology: Cause: chemotherapy agents (5-FU, capecitabine) Description: sunburnt-like hands that appears 2-3 months after starting chemotherapy where the whole sole or palm turns completely red 1/6 Hand-Schüller-Christian 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: Pinkish crusted papules with lytic bone lesions in skull, diabetes insipidus, and exophthalmos At risk: 2-6 yo 1/2 Harlequin Ichthyosis Etiology: Define: severe genetic skin disorder characterized by thick, diamond-shaped plates of skin separated by deep cracks Tx: oral retinoids Hereditary Hemorrhagic Telangiectasia / Osler-Weber-Rendu Etiology: Cause: AD mutation (loss of function of ENG gene) causing thin-walled blood vessels, especially in the mouth and GI tract Description: blanching lesions (telangiectasias) on skin and mucous membranes, recurrent epistaxis, skin discolorations, arteriovenous malformations, GI bleeding, hematuria Herpes Labialis (cold sores) Etiology: Cause: HSV1 Description: shallow oral ulcers that rupture and dry after a few days forming a thin, yellowish crust and will completely heal At risk: children (transmitted through contact with oral secretions) Herpes Zoster / Shingles Etiology: Cause: recurrent VZV Description: eruption of a “belt” of maculopapular lesions with erythematous base along a single dermatome on the trunk To play, press and hold the enter key. To stop, release the enter key. Hidradenitis Suppurativa (HS) / Acne Inversa Etiology: occlusion + rupture of follicles in folliculopilosebaceous units Locations : axillae, groin, perineum, perianal, inframammary At risk : puberty, women, obesity, cigarette smoking, IBD Appearance : erythematous nodules, pustules, bridging comedones Sx : recurrent tender nodules + abscesses that drain + scar Tx : mild = Hibiclens (1 min soak + then wash), Doxy, Clinda lotion, spironolactone severe/scarring = biologic (Bimzelx, Humira) Hirsutism Etiology: late-onset CAH, prolactinoma, drugs (androgens, minoxidil, cyclosporine, carbamazepine) Location : mustache or beard-liike distribution Tx : correcting underlying hormonal imbalance (spironolactone, OCPs) + hair removing tx Hypertrichosis Etiology: Description: excessive hair growth Associate with: Porphyria cutanea tarda, anorexia nervosa, malignancy, drugs Hypertrophic Scar Etiology: Cause: dysregulation of the normal healing process resulting in excessive production of collagen, elastin, proteoglycans, and extracellular matrix proteins Description: Pink to red, slightly raised, or flat, limited to confines of wound, and usually occurs within weeks of injury Hypohidrotic Ectodermal Dysplasia Etiology: Define: genetic disorder characterized by the abnormal development of ectodermal tissues, specifically the skin, hair, nails, teeth, and sweat glands Appearance: thin, wrinkled, and dark-colored skin around the eyes 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

A Acanthosis Nigricans Appearance : hyper pigmented leathery plaque Location : back of the neck, axilla, groin Associated with : gastric, lung adenocarcinoma, Cushing Syndrome, PCOS Acanthosis Palmaris / Tripe Palms Appearance : thickened velvety pattern of skin often gives a yellow hue to the skin Location : palms and dorsal hands Accessory Tragus Define : common, benign, congenital anomaly of the ear Appearance : small, skin-colored nodule Location : anterior to tragus Tx : excise Acne Keloidalis Nuchae Appearance : flesh colored, dome shaped papules + pustules Location : posterior scalp + neck At risk: young darker tone male Acne Vulgaris Etiology : folliculosebaceous unit is blocked, swollen, ruptures, and inflames the surrounding skin Location : forehead, nose, chin, chest, upper back Tx : tretinoin, adapalene, doxy, spironolactone Acrochordons / Skin tags Appearance: skin colored pedunculated, fleshy papules Location : eyelids, neck, axillae, groin Tx: snipping, LN, ED Actinic Keratosis (AKs) Appearance: pink/hyperpigmented thin scaly papules Location : sun exposed areas Tx: cryo African Trypanosomiasis Etiology: T.b. rhodensiense, T.b. gambiense Appearance: - At site of Tsetse fly bite, chancre forms with enlarged lymph nodes - 2-3 weeks later, a central necrotic eschar forms - 6-8 weeks later, trypanids form (red patches, urticaria, targetoid lesions) 1/3 AL Amyloidosis Etiology: accumulation of an immunoglobulin light chain (lambda > kappa) protein Appearance: waxy skin with periorbital purpura ( Raccoon eyes) Albinism Etiology: mutation of TYR gene (oculocutaneous) = decreased tyrosine activity or defective tyrosine transportation Inheritance : AR Appearance: diffuse depigmentation Allergic Contact Dermatitis Etiology: type IV hypersensitivity reaction to allergen (nickel, poison ivy, PCN, detergents) Appearance: erythematous vesicular rash with edema 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 Alopecia Areata Etiology : autoimmune condition Appearance : hairless, smooth patches without scale, erythema, or inflammation Test : positive hair test at periphery Ass. conditions : autoimmune disorders, Down syndrome , atopy Dermoscopy : exclamation point hairs Tx : topical clobetasol solution , minoxidil, intralesional triamcinolone Angioedema Appearance : swelling of dermis and SQ tissue Location : face or portion of extremity Sx : painful or burning, but not pruritic Angiosarcoma Etiology : 20% have history of radiation to head or neck Appearance : blue or purple macular, sometimes raised or nodular; often become ulcerated or hemorrhagic Location : face + scalp Tx : complete resection with wide margins Prog : 5 yr survival is ~35% Angular Cheilitis Appearance : erythematous fissuring, thin scales and crust Location : corner of mouth Ass. conditions: iron deficiency anemia, vitamin B deficiencies, protein malnutrition, chronic inflammatory diseases (IBD, Crohn Disease, Sjogren Syndrome) 1/8 Aphthous Ulcer / Canker Sore Etiology : unknown antigen stimulates keratinocytes via increase pro-inflammatory cytokines Appearance : round to oval ulcer with peripheral rim of erythema + yellowish adherent exudate centrally Location: mucosa of lips, oral mucosa, tongue margins Aplasia cutis Etiology : intrauterine trauma, vascular compromise, infection (HSV, VZV), meds (methimazole), Patau syndrome (on occiput) Appearance : well-demarcated erosion or ulcer with loss of hair Arsenical keratosis Define : development of thickened, wart-like growths on the skin due to chronic arsenic exposure Appearance : multiple, small, yellowish, and horny ( keratotic) papule s or plaques Location : palms + soles At risk : farmers, well water use Tx : cyro, ED, 5-FU, imiquimod, oral retinoids Arterial Ulcer Etiology : peripheral artery disease (atherosclerotic stenosis) Appearance : well defined punched out ulcer Location : distal toes 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 Atopic Dermatitis / Eczema Etiology : type 1 HS reaction associated with other atopic diseases; loss of function of FLG gene = mutation in filaggrin Appearance : i rregular border pink plaque with scale +/- lichenification Location : flexural surfaces (adults) vs extensor surfaces (children) Atopic Eruption of Pregnancy (AEP) / Prurigo of Pregnancy Etiology : pregnancy causing cytokine imbalance Appearance : hyper pigmented or erythematous papules Prog : no increased risk to fetus Tx : topical steroids 1/5 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

Explore Daly’s Diverse Dermatology Dictionary: an inclusive resource with dermatology images on a range of skin tones for better, equitable medical education. Welcome to: Daly's Diverse Dermatology Dictionary From my very first year in medical school, I was struck by a glaring omission in our training: nearly all the dermatology images we learned from depicted conditions on white skin . When images of darker skin were included, it was usually only for diseases more common in those populations, such as lupus or sarcoidosis. I searched for a truly comprehensive resource—one where common and uncommon dermatologic conditions were shown side by side on both lighter and darker skin—but that resource simply didn’t exist. What began as a personal frustration quickly became the driving force behind this project. Throughout my medical education, as I studied each new condition, I started carefully compiling a databank with photos of skin diseases across the full spectrum of skin tones. This was not just to deepen my own understanding, but to ensure my classmates could also learn to recognize conditions on every patient they might encounter. When I shared these resources, the response was immediate: astonishment that no one had done this before and enthusiasm for a tool that filled such a crucial gap. After hundreds of hours and countless photographs, I’m proud to make this collection public - Bridging the Gap: Daly’s Diverse Dermatology Dictionar y. This is my passion project —born from the conviction that medical education must reflect the diversity of the world we serve. I have no financial disclosures and no conflicts of interest; I receive no compensation or sponsorship from this work. My only goal is to improve inclusivity and accuracy in medical education. I hope this resource expands horizons for students and educators, and helps foster a more accurate, equitable, and compassionate practice of medicine. Please enjoy, share widely, and if you’d like a downloadable version, scroll to the bottom. Your enthusiasm fuels my own, and I’m grateful to share this journey with you. By Letter... A B C D E F G H I J K L M N O V P W Q X R Y S T U Z Submit Your Own Photo Please take a moment to fill out the form. First Name Last Name Email Diagnosis Leave us a message and include: (1) that you consent to allowing me to use your photo within my dictionary (2) the photo and diagnosis. Submit Thanks for submitting! Coming soon... Quick View Bridging the Gap: Daly's Diverse Dermatology Dictionary - for medical students Price $9.99

B Bacillary Angiomatosis Etiology : Bartonella henselae or Bartonella quintana + CD4 < 100; transmitted by cats or lice Appearance : erythematous to violaceous papules that grow into nodules; very friable and bleeds profusely Tx : erythromycin or doxy Bacterial Folliculitis Etiology : S. aureus , unless it is Gram negative (Escherichia coli, Pseudomonas aeruginosa, Serratia marcescens, Klebsiella or Proteus species ) or Hot tub Folliculitis (Pseudomonas aeruginosa) Appearance : follicular pustules, erythematous nodules Tx : warm compress, anti-inflammatories, mupirocin Basal Cell Carcinoma MC skin cancer Etiology : UV radiation, mutation in patched (PTCH) tumor suppressor gene Appearance : skin colored or pink pearly papule with rolled borders and telangiectasias Dermoscopy : sharp demarcated dark vessels Tx : excision, MOHs, cry o, PDT Behçet Disease Etiology : unknown – assumed to be connected to autoimmune response Appearance : oral + genital ulcers that are 3-5 mm, round to oval ulcers with peripheral rim of erythema + yellowish adherent exudate centrally (indistinguishable from aphthous ulcers) At risk : eastern + central Asian; ~35 yo Blastomycosis Etiology : Blastomyces dermatitidis Appearance : purplish-gray verrucous lesions with heaped borders or friable lesions that ulcerate Location : face, neck, extremities Tx : itraconazole, amp B 1/5 Blue Nevus Etiology : incomplete migration of melanocytes from neural crest to the skin during fetal development Appearance : dark blue macule, papule, or plaque Location : hands, feet, face At risk : women, asians Tx : if excised (looks like a black hole) Blueberry Muffin Syndrome Etiology : Rubella, CMV Appearance : descending blue, violaceous macule s + papules Ass. sx: anemia, hepatosplenomegaly, IUGR, jaundice Bowen disease / In situ SCC Etiology : UV radiation, HPV Appearance : irregular red/orange/brown scaly plaques Tx: cryo, observe, excise Bowenoid papulosis Etiology : HPV 16,18 Appearance : reddish-brown papules Location : anogenital region Tx: ED, laser, cryo 1/3 Bullous Diabeticorum Etiology : diabetes Location : lower extremities Tx : self resolving 1/4 Bullous Impetigo Etiology : S. aureus (exfoliative toxins A + B which targets desmoglein 1) Appearance : thin roofed bullae that tend to rupture spontaneously and ooze leaving a yellow crusty rim At risk : <2 yo Location : face, trunk, extremities, buttocks, perineal regions Tx: oral flucloxacillin 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 Bullous Pemphigoid Etiology : Autoantibodies to BP230 + BP180 (hemidesmosomes) Appearance : large, tense, fluid-filled blisters with urticarial/erythematous base Location : lower abdomen, upper thighs, or armpits; typically oral mucosa is spared Ass. with : HBV Tx: topical or systemic steroids Burns Etiology : any external heat/radiation source Types : - Superficial burn = localized, dry, blanching redness with no blisters - Superficial partial-thickness burn = blisters, blanches with pressure, swollen, warm - Deep partial-thickness burn = blisters that are easily unroofed, does not blanch with pressure and painful only to deep pressure - Full-thickness burn = white, waxy, dry, inelastic, leathery, does not blanch with pressure, painless - Deeper injury burn = white, dry, inelastic, does not blanch with pressure, painless Superficial burn Superficial burn Superficial burn Superficial partial-thickness burn Superficial partial-thickness burn Superficial partial-thickness burn Superficial partial-thickness burn Full-thickness burn Full-thickness burn Full thickness burn Full-thickness burn 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

V Venous Ulcer / Stasis Ulcer Etiology: chronic venous insufficiency Appearance: irregular border, shallow, exudative ulcer At risk : elderly, hx of DVT, obese, immobility Location : Gaiter area (malleoli region) Ass. condition : venous dermatitis Tx : wound care and compression Verrucae planae Etiology: HPV 3 and 10 Appearance: skin colored or pink smooth surfaced slightly elevated flat topped papules Location : dorsal hands, arms, face Verruca vulgaris / cutaneous warts Etiology: HPV 1-4 Appearance: cauliflower-like papules with a rough papillomatous and hyperkeratotic surface ranging in size from 1 mm to 1 cm+ Location : fingers, dorsal hands, knees, elbows Go to link Go to link Go to link Go to link Go to link Go to link Go to link Go to link 1/1 Vibrosis Etiology: Vibrio vulnificus, ingestion of contaminated seafood or exposure of open wounds to seawater Appearance : widespread hemorrhagic bullae Sx : fevers, chills, hypotension Tx : doxy, 3rd gen cephalosporin 1/4 Vitiligo Etiology : autoimmune attack on melanocytes Associated conditions : DM, Graves disease, Addison disease, adrenal insufficiency , SLE, RA Appearance : sharply demarcated depigmented patches and macules Location : periorificial, acral Tx : topical steroids, topical calcineurin inhibitors, phototherapy, laser tx 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 Vohwinkel Syndrome / PPK Mutilans Etiology: Appearance: star shaped hyperkeratotic plaque Location : on knuckles, palms, soles Ass. condition s: autoamputation of fingers, deafness 1/8 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

T Telangiectasia Etiology: Cause: UV light exposure, irradiation, trauma, topical glucocorticoids (atrophic skin) Description: spider veins (capillaries + venules) Associated with: Scleroderma (CREST) Telogen effluvium Etiology: Etiology: illness, hospitalizations, preg, meds, surgeries Prog: resolves within 6-12 mo Thrombotic Thrombocytopenic purpura Etiology: Cause: excessive platelet activation and aggregation potentially due to (AR) genetic or acquired deficiency of ADAMTS13 (cleaves vWf) Description: Petechiae (small, flat, red spots) – Purpura (red, purple larger spots) Tinea Etiology : dermatophytes Location/Appearance/Tx: Tinea corporis = body annular, scaly, erythematous plaques with slightly raised borders and partial central clearing topical antifungals (terbinafine) Tinea manuum = hand fine palmar scaling + dryness with redness topical antifungals (terbinafine) Tinea cruris = groin well demarcated scaly borders topical antifungals (terbinafine) + absorbant powders + loose undergarments Tinea capitis = scalp broken hairs resembling dots, a moth eaten appearance due to patchy hair loss oral griseofulvin Tinea pedis = foot silvery white scaling along soles or plantar surface topical antifungals (terbinafine) + powders 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 Go to link Go to link Go to link Go to link Go to link Go to link 1/2 Tinea Nigra Etiology: Cause: Hortaea werneckii Description: pigmented (gray to black) macules, irregular patches Location: palms + soles At risk: laborers in Africa, Asia, Central America, South America Toxic Shock Syndrome Etiology: S. aureus enterotoxin Type B or toxic shock syndrome toxin 1 (TSST-1) from tampons or other foreign objects located in the body for a long period of time Sx : fever, diffuse macular erythematous rash, low BP shedding of the skin in large sheets, especially from palms + soles, 1-2 weeks after the onset of illness Location : palms + soles Tx : supportive care + systemic abx Traction Alopecia Etiology: Location: frontal hairline, sides Cause: regularly wearing tight chignon, cornrows, dreadlocks, weaves, braids, hair extensions, and chemical relaxers and rollers Description: itching, redness, scaling, folliculitis, multiple short broken hairs, hair loss Location: front (frontal) and sides of the scalp At risk: African American women Transient Neonatal Pusular Melanosis Etiology: Appearance: pustules that rupture leaving scale and PIH At risk: skin of color 1/4 Trichostasis Spinulosa Etiology: To play, press and hold the enter key. To stop, release the enter key. Trichotillosis/Trichotillomania Etiology: Appearance: different lengths of hair in patch; have black dots from short hairs Trousseau’s Syndrome Etiology: Cause: people with occult or recently diagnosed visceral malignant disease (pancreatic cancer) Description: Lesions appear as inflamed, reddened lines or lumps in the fat under the skin Location: trunk or extremities Tuberous Sclerosis Etiology: Cause: AD mutation in TSC1 (hamartin), TSC2 (tuberin) Description: hypomelanotic macules / ash-leaf spots + angiofibroma (small bumps especially around nose + cheeks) shagreen patch Ash leaf marks Ash leaf marks Ash leaf marks Periungual fibroma Periungual fibroma Periungual fibroma Periungual fibroma Periungual fibroma Periungual fibroma Angiofibromas Angiofibromas Angiofibromas Angiofibromas Angiofibromas Angiofibromas Angiofibromas Angiofibromas Angiofibromas Angiofibromas Angiofibromas 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

All Posts By: Paige All Posts Science in Skincare Medical School New Products I Have Tried Fun Facts! Search Paige Daly 5 minutes ago 5 min How I Passed COMLEX 1 and Step 1 AND Got Married in the Same Month With careful planning and dedication, balancing medical school, board exams, and personal life is not just possible—it's achievable! Post not marked as liked Paige Daly Feb 7 3 min Unlocking the Science of Skincare: A Medical Student's Journey into Active Ingredients As a medical student, my days are filled with lectures, labs, and countless hours of studying. Amidst the chaos of medical school, I find... Post not marked as liked Paige Daly Dec 12, 2023 2 min The Science Behind Pimple Patches: Uncovering the Secrets to Clear Skin Pimples – the bane of every teenager's existence. Whether you're battling occasional breakouts or dealing with persistent acne, the quest... Post not marked as liked Paige Daly Dec 8, 2023 2 min My Illuminating Discovery with DRMTLGY's Brightening Eye Masks In the ever-evolving world of skincare, one brand recently caught my attention and became part of my self-care routine: DRMTLGY.... Post not marked as liked 1 2 3 4 Paige Daly Welcome to DalyDermatology! 💖 Dive into the world of skincare science with me as we explore the secrets behind that radiant glow. Join me on this journey as a medical student, continually learning and sharing my experiences in dermatology. ✨ follow me @dalyderm