Derm Dx: A hyperkeratotic plaque on the left temple

A 63-year-old male was referred for evaluation and treatment of a lesion that arose on his left temple. The growth was first noted several months ago. It was asymptomatic until recently; the edge occasionally bleeds. He has experienced ample past sun exposure and smokes cigarettes. He denies prior history of skin cancer. Examination reveals a 1.4-cm hyperkeratotic plaque with an ...