Derm Dx: Dome-shaped erythematous nodule on the scalp

A patient, aged 67 years, requested an evaluation of an enlarged lesion on his mid scalp. The lesion was first noted four weeks prior to presentation. The growth was asymptomatic and the patient denied associated itching, burning or bleeding. The patient was fair skinned and admitted to ample sun exposure over many decades.

Past medical history was positive for multiple ...