A 10-year-old girl has a routine check of her health status. On physical examination, a flat, uniformly brown, 2-cm skin lesion is noted just above the right buttock. The lesion has been present since birth and has not changed in appearance. The figure shows the representative microscopic appearance of the lesion. What is the most likely diagnosis of this lesion?
a) Acanthosis nigricans
b) Dysplastic nevus
c) Melanocytic nevus
d) Seborrheic keratosis
