The "What's Your Assessment?" series includes a short case presentation and differential diagnosis. it is followed by a discussion of the disease or condition and the rationale used in each step of the assessment.

History

This 52-year-old Caucasian male reported an approximate 1-year history of change in a longstanding scalp lesion. Over the previous 12 months, the lesion had been progressively increasing in size. There was no history of bleeding or ulceration at the site. The patient denied a personal and family history of skin cancer.

Description of Skin Lesion

Figure 1. On the left lateral scalp, there is a 1.5 cm lightly violaceous tumor. At the periphery, and ...