Psoriasis is a common dermatological disorder, consisting of both an inflammatory and a hyperproliferative component. Scaly, erythematous infiltrated skin lesions are indicative of psoriasis vulgaris. The disease is characterized micromorphologically by epidermal hyperplasia with incomplete differentiation, intraepidermal accumulation of polymorphonuclear neutrophils, elongated papillae containing dilated, tortuous capillaries and lymphohistiocytic infiltrate.