What is unilateral acanthosis nigricans (AN)?

Updated: Oct 14, 2020
  • Author: Jason H Miller, MD; Chief Editor: William D James, MD  more...
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Unilateral acanthosis nigricans, sometimes referred to as nevoid acanthosis nigricans, is believed to be inherited as an autosomal dominant trait. Lesions are unilateral in distribution and may become evident during infancy, childhood, or adulthood. Lesions tend to enlarge gradually before stabilizing or regressing. Unilateral acanthosis nigricans lesions may represent a unilateral epidermal nevus.

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