Dermatology Online Journal

Psoriasis is a complex, chronic immune-mediatedinflammatory disease that most commonly presentsas well-demarcated erythematous plaques withmicaceous scale, affecting roughly 3-4% of the USpopulation [1-4]. Clinically, lesions are often welldemarcatedthick, scaly, erythematous plaques,characteristically located on the extensor surfaces,such as elbows and knees [1]. In most cases, clinicalimpression is sufficient to diagnose psoriasis. However,sometimes psoriasis can mimic other cutaneousdisorders and biopsy may be warranted to discoverthe diagnosis. We report an unusual presentation ofpsoriasis clinically mimicking mycosis fungoides.