Adult with a red plaque at the site of a childhood vaccination scar.

摘要

An 89-year-old patient presented with an asymptomatic lesion on her left proximal arm at the site of a childhood vaccination scar. The lesion had persisted for one and a half years. Physical examination revealed a 3.7-cm X 2.9-cm erythematous, ill-defined plaque with thin, overlying scale (see accompanying figure). There was no axillary lymphade-nopathy. A full skin examination, including the oral mucosa, was otherwise unremarkable. Results of a potassium hydroxide preparation of a skin scraping were negative.