Pink nodule on the crown of the head

A 78-year-old woman with Alzheimer disease was brought in for evaluation of a scalp lesion first noticed by her granddaughter one month earlier. Because of her dementia, the patient was unable to provide a reliable history.

Her granddaughter reported no patient or family history of previous skin cancer or other malignancy. Physical examination revealed a 10-mm × 5-mm pink, somewhat pearly, ...