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This 40-year-old homosexual man presented with weakness, weight loss, and painless, nonpruritic facial lesions of six weeks’duration. Similar skin changes were present over his legs and lower trunk. On physical examination, the lesions were papulopustular, round or oval, andsharply demarcated. They varied in size from a few millimeters to several centimeters. Many were umbilicated, some ulcerated, and a few crusted. Themucous membranes were normal.
Also known as syphilis maligna praecox and lues maligna, this is a rare but completely reversible variant of secondary syphilis.Although its incidence had been decreasing since the beginning of the 20th Century, the number of reported cases has increased of late, most of them inpatients with HIV infection. The skin lesions are pleomorphic, appear in various stages of development, and become widespread, affecting the face and scalp mostoften. They begin as papulopustules, rapidly undergo necrosis, and tend to form deep crusts. Mucous membranes are involved in about a third of the cases.Histologic examination shows dense infiltrates of plasma cells and histiocytes along with obliterative vasculitis of medium-sized vessels. Spirochetes may bevisible in the tissue sections, under dark field microscopy, or both. In addition, a reactive serologic test for syphilis, sometimes with very hightiters, is the rule.
The differential diagnosis includes fungal infection, leishmaniasis, verrucous sarcoidosis, bartonellosis, leprosy, yaws,mycosis fungoides, and pyoderma gangrenosum.
The patient shown had positive serologic tests for syphilis, and after three weeks of penicillin therapy, his skin lesions resolvedcompletely.
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