R
Raynaud’s Phenomenon
Description: vasospastic event where digits change from blue to white to red
Associated with: Scleroderma (CREST), SLE, Cold AIHA
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Reticulohistiocytoma (Solitary Epithelioid Histiocytoma)
Appearance: solitary red to brown to yellow papule or nodule in adults
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Richner Hanhart Syndrome
Appearance: dendritis keratosis, painful hands
Inheritance: AR
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Rocky mountain spotted fever (RMSF)
Etiology: 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
Rosai Dorfman Disease
Histo: S100+
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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 |
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 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: Sporothrix schenkii
Description: multiple inflammatory subcutaneous nodules in a linear fashion along the course of the lymphatic channels
Roseola / Exanthema Subitum / Sixth Disease
Etiology: HHV-6 / HHV-7
Description: red lacy appearance (spares face), rose-colored macule (post high fever)
Rubella / German measles / 3 day measles
Etiology: Rubella
Description: fine, erythematous, blanchable rash
Location: begin on the face and spreads down
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Rubeola / Measles
Etiology: measles virus (paramyxovirus)
Description: diffuse, blanchable, erythematous, maculopapular rash + blue-white Koplik spots on buccal mucosa
Location: rash begins at head and moving down
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