Psoriasis mimicking mycosis fungoides clinically.

Psoriasis is a complex, chronic immune-mediated inflammatory disease that most commonly presents as well-demarcated erythematous plaques with micaceous scale, affecting roughly 3-4% of the US population [1-4]. Clinically, lesions are often well demarcated thick, scaly, erythematous plaques, characteristically located on the extensor surfaces, such as elbows and knees [1]. In most cases, clinical impression is sufficient to diagnose psoriasis. However, sometimes psoriasis can mimic other cutaneous disorders and biopsy may be warranted to discover the diagnosis. We report an unusual presentation of psoriasis clinically mimicking mycosis fungoides.