Pigmentary regression in a giant nevocellular nevus: a case report and a review of the subject.

A giant congenital nevocytic nevus (CNN) on the trunk was followed in a patient from age three months to 23-years-old. During that time the nevus underwent pigmentary regression leaving 2-3 mm lentigines without any evidence of vitiligo or halo formation around the giant CNN. Histopathologically, nevus cells remained in the dermis.