70 results
Tinea Versicolor (Pityriasis versicolor) 
NOT a dermatophyte infection 
Caused by saprophytic, lipid-dependent yeasts 
Clinical 
 •
Tinea Versicolor (Pityriasis ... dermatophyte infection Caused ... • Involves trunk ... #Dermatology #SkinRash
Papulosquamous Skin Rash - Differential Diagnosis Algorithm
Erythrematous or violaceous papules & plaques with overlying scale
 •
phenomenon • Pityriasis ... tree pattern on trunk ... Papulosquamous #SkinRash ... Diagnosis #Algorithm #causes
Trunk / Sacral Skin Ulcers - Differential Diagnosis Algorithm
Neoplastic
 • Squamous cell carcinoma
 • Basal cell
Trunk / Sacral Skin ... Radiation #Trunk ... #Sacral #SkinRash ... Diagnosis #Algorithm #causes
Causes of Erythema Nodosum - Mnemonic

NO cause found in 60% of cases
Drugs (antibiotics e.g., sulfonamides, amoxicillin)
Oral
Causes of Erythema ... Mnemonic NO cause ... found in 60% of cases ... Nodosum #Mnemonic #Causes ... #Dermatology #SkinRash
Pustular Skin Rash - Differential Diagnosis Algorithm
Pruritic / Scaly / Erythematous lesions, usually poorly demarcated
Acneiform -
scars on face & trunk ... thick honey-yellow crusts ... #Pustular #SkinRash ... Diagnosis #Algorithm #causes
Erythema Multiforme: skin eruption secondary to allergic reaction from an antibiotic.

Charlie Goldberg, M.D. - UCSD Catalog
#Dermatology #SkinRash ... Erythema #Multiforme #Trunk
Characteristic features of the rash are:

-Rough texture (like sandpaper)
-Worse in the skin folds e.g. groin, axilla,
Peds #Pediatrics #SkinRash ... #ScarletFever #Trunk
Skin Hypopigmentation - Differential Diagnosis Algorithm

Diffuse Congenital - Generalized hypopigmentation of hair, eyes, skin
 • Phenylketonuria
hyperpigmented) • Pityriasis ... Diagnosis #Algorithm #causes
Common Dermatological Conditions - Distribution and Morphology
 • Acne vulgaris - Face, upper back, chest -
Periorificial, trunk ... honey-colored crusts ... Varicella - Face, trunk ... • Pityriasis ... Cherry angioma - Trunk
Erythema Nodosum - Causes and Differential Diagnosis 
Appearance:  erythematous painful lumps usually 1-6 cm in
Erythema Nodosum - Causes ... Erythema #Nodosum #Causes ... #Dermatology #SkinRash