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Diseases

Genetic and Rare Diseases Information Center (GARD)

Becker's nevus


Other Names for this Disease
  • Becker melanosis
  • Becker nevus
  • Becker naevus
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Symptoms

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What are the signs and symptoms of Becker's nevus?

A Becker's nevus typically begins to develop during childhood or adolescence on the shoulder or upper trunk, although it may develop on other areas of the body.[1] Pigmentation may be subtle at first, but the nevus typically expands during the first several years.[2] The resulting birthmark is usually large, brown, and on only one side of the body. Sometimes it may cover over half of the upper back or chest. After puberty, the nevus often darkens and becomes hairier than the surrounding skin (hypertrichosis). In some individuals, acne may develop within the nevus.[1]

Rarely, there may be abnormalities of underlying tissues associated with the nevus, such as ipsilateral breast hypoplasia (underdevelopment of the breast on the same side of the body as the nevus). In these rare cases, the condition is known as Becker nevus syndrome, which is a type of epidermal nevus syndrome.[1] In addition to the nevus, individuals with Becker nevus syndrome may have various skin-related (cutaneous), muscular or skeletal abnormalities.[1][3]

Becker nevus is considered a benign process; however, an association with melanoma was discussed in a study with 9 patients in whom both Becker nevus and melanoma developed. Five patients developed melanoma on the same body site as the Becker nevus, but in 1 patient only did melanoma develop within the Becker nevus.[2]
Last updated: 1/28/2016

References
  1. Ngan V. Becker naevus. DermNet NZ. 2016; http://www.dermnet.org.nz/lesions/beckers-naevus.html.
  2. Rivers JK. Becker Melanosis. Medscape Reference. March 4, 2014; http://emedicine.medscape.com/article/1068257-overview.
  3. Becker Nevus Syndrome. OMIM. May 4, 2000; http://omim.org/entry/604919.


Other Names for this Disease
  • Becker melanosis
  • Becker nevus
  • Becker naevus
See Disclaimer regarding information on this site. Some links on this page may take you to organizations outside of the National Institutes of Health.