Quiz Time! What is this painful lesion?

A 66-year-old construction worker visited his doctor about a slightly painful lesion that he first noticed on his arm 2 months prior. The patient had a medical history of renal cell cancer and was on sorafenib treatment. He reported a history of smoking (40+ years). On examination, a smooth, crateriform nodule with a central keratotic core was seen. What’s the diagnosis?

A)     Actinic keratosis

B)     Basal cell carcinoma

C)     Keratoacanthoma

D)     Molluscum contagiosum


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