Derm Dx: A growth on the scalp in an elderly man

The patient is a 91-year-old man referred by his barber for assessment of a growth on his scalp. He states that he was told by a physician 2 years ago that it was a "basal cell" cancer, but he denies ever undergoing biopsy of the site. He is a nonsmoker and admits to many years of prolonged sun exposure. Examination ...