Verrucous psoriasis in a male patient with a history of vulgar psoriasis: Case report and literature review.

Verrucous psoriasis is an atypical and rare variant of psoriasis, with few cases reported in the literature, characterized by the presence of simetric hypertrofic and verrucous plaques on the limbs and trunk. We present the case of a 63 year old male patient with a history of vulgar psoriasis 20 years ago, in treatment with topical steroids, who has been presenting for 10 years a verrucous plaque in the distal third of the posterior aspect of the leg. Biopsy of the lesión is performed with a diagnostic impression of squamous cell carcinoma (verrucous), but the histopathologic study shows compatible changes with a verrucous psoriasis, ruling out the presence of malignancy