A 34-year-old African American man presented to our clinic for evaluation of enlarging purple nodules over his neck. The lesions, which had first appeared two months earlier, caused significant itching. A painful rash had preceded the nodules by about a month, but the eruption had resolved after about a week. The patient, who was HIV-positive, reported that his CD4 count had been stable on antiretroviral therapy. A physical examination revealed no other lesions or abnormalities. There was no family history of similar nodules. The patient wanted to know what could be done for these new lesions.

What is the diagnosis?

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