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What Is The Cause Of This Red Scalp Nodule?

What Is The Cause Of This Red Scalp Nodule?

Case Report

A 63-year-old man presented for evaluation of a new asymptomatic lesion on his head. His past medical history was significant for renal cell carcinoma, diagnosed 15 years earlier, with subsequent treatment and no further evidence of residual disease. Cutaneous examination revealed a 6 x 6-mm firm and painless erythematous nodule on the frontal scalp (Figure). There was alopecia in the area occupied by the nodule. Complete cutaneous examination did not reveal any other nodules, and there were no palpable lymph nodes. A shave biopsy of the nodule was performed.  

Figure

What Is The Diagnosis?

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