Congenital Melanocytic Nevus
Congenital melanocytic nevus (giant congenital nevus), when large, is a risk factor for malignant melanoma. The nevus in this image is more than about 8 inches (about 20 centimeters), has an irregular border, and has several different colors.
Image courtesy of Carl Washington, MD, and Mona Saraiya, MD, MPH, via the Public Health Image Library of the Centers for Disease Control and Prevention.
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