Secondary syphilis mimicking psoriasis vulgaris on the buttock

Abstract

Sir, Secondary syphilis is caused by Treponema pallidum, classically characterized by a diffuse, symmetric macular or papular eruption involving the entire trunk and extremities [1]. We, herein, describe a case of secondary syphilis mimicking psoriasis vulgaris in an unusual location and with specific histologic hallmarks. A 28-year-old homosexual male presented with asymptomatic, erythematous patches of the buttock, which were misdiagnosed as psoriasis vulgaris for one month. He reported a history of sexual contact with an anonymous male four months prior to presentation. A clinical examination revealed multiple, well-defined, erythematous, scaling patches on the buttock (Fig. 1a). He had no regional lymphadenopathy. Other mucocutaneous manifestations were undetectable.