Review Question - QID 214385

A 10-month-old boy is brought to the pediatrician by his grandmother. She reports she is worried about a dark spot on the patient’s back. The patient’s grandmother began babysitting the patient 2 weeks ago after his mother went back to work. She noticed the spot 2 weeks ago, and it has not changed since. The grandmother is not sure if the lesion was there earlier than this. The patient was previously under the care of the mother’s boyfriend who is no longer in a relationship with the mother. The patient was born at 38 weeks by vaginal delivery. He is otherwise healthy. There is a family history of melanoma. Physical exam is notable for the finding in Figure A. Which of the following is the most appropriate next step in management?