Signs
1. Hyperpigmentation and Hypertrichosis
2. Overlies a firm nodular base
3. Lesion may "ripple" when stroked
Distribution
1. Anywhere
Differential Diagnosis
1. Congenital Malanocytic Nevus (distinguish with biopsy)
Labs
1. Biopsy shows Arrector Pili Muscles
Course
1. No increased risk of malignant transformation
Management
1. None

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This page was written by Scott Moses, MD. This page was last revised before 5/10/08, prior to consistent tracking of revision date. This page was last published on 6/1/2008. Please send comments and questions to the editor. Contact information may be found on the page About the Family Practice Notebook. These pages are best viewed with Microsoft Internet Explorer 6.0.