A 58-year-old white woman presented with a 4-year history of a scalp nodule that had been slowly enlarging. Although the lesion had previously been asymptomatic, the patient reported that just before her presentation, the lesion had bled, drained clear fluid, and had become pruritic.On physical examination, a tan to violaceous nodule, 15 mm in size, with a telangiectatic border and central erosion, was seen on the left frontal scalp (Fig. 1). A skin biopsy was taken.
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