Pigmented Cystic Masses on the Scalp

A 67-year-old man presented to the dermatology clinic with 3 asymptomatic pigmented papules on the scalp.The patient reported that he was unaware of the lesions until they were pointed out weeks earlier by his primary care physician during a routine visit.He then was referred to dermatology for follow-up.Physical examination at the current presentation revealed clustered firm, smooth, well-circumscribed, pigmented papules on the scalp measuring 5 to 8 mm.The patient reported no personal or family history of skin cancer but stated that he spent a lot of time outdoors and had a history of 6 blistering sunburns in his life.A punch biopsy of each lesion was performed.WHAT'S YOUR DIAGNOSIS?a. apocrine hidrocystoma b. blue nevus c. melanoma d. pigmented basal cell carcinoma e. seborrheic keratosis