Clinical Challenge: Asymptomatic Genital Rash

A 65-year-old man presents with an asymptomatic rash on his penis that has persisted for 2 weeks. He denies prior episodes of a similar rash, any recent sexual contact, commencement of any new medications, or history of skin disease. Examination revealed shiny, well-demarcated erythematous patches of the corona and prepuce. No exudates or vesicles were apparent and inguinal nodes were ...