Case 2

An 8-week-old black infant is brought to the dermatology clinic by his parents for evaluation of a brown lesion on his lower back that measures approximately 7 cm in diameter. His parents report that the discoloration was present at birth but has become darker as the child has grown older. The patient is otherwise healthy, and the lesion is not causing him any pain or discomfort. Physical examination reveals a lesion with regular borders and smooth topography.

Can you diagnose the condition in Case 2?

A. Mastocytoma
B. Congenital dermal melanocytosis
C. Café au lait macule
D. Congenital melanocytic nevus

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