Picture of Neurofibromatosis (Café au lait)

Neurofibromatosis is characterized by skin changes including café au lait macules. Pictured is such a macule, with very clearly defined borders, on the buttock area of a patient with the condition.
Image Source: Color Atlas & Synopsis of Pediatric Dermatology
Kay Shou-Mei Kane, Jen Bissonette Ryder, Richard Allen Johnson, Howard P. Baden, Alexander Stratigos
Copyright 2002 by The McGraw-Hill Companies. All rights reserved.
Text Reference: National Institute of Neurological Disorders and Stroke: "Neurofibromatosis Fact Sheet"
Text Reference: National Institute of Neurological Disorders and Stroke: "Neurofibromatosis Fact Sheet"