Derm Dx: Purplish scrotal lesions in a man with hypertension

A 70-year-old man comes to the office because he is concerned about purplish scrotal lesions. These are asymptomatic and "possibly present for several years." His medical history is positive for hypertension, for which he currently takes hydrochlorothiazide. On physical examination, scattered violaceous papules, each measuring about 1 mm in diameter, are scattered on the scrotum, which has a reddish tinge. ...