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Giant congenital nevus

Other Names for this Disease
  • Bathing trunk nevus
  • Congenital giant pigmented nevus
  • Congenital hairy nevus
  • Giant hairy nevus
  • Giant pigmented hairy nevus
More Names
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A congenital giant nevus is a dark-colored, often hairy patch of skin that is present at birth. It is usually smaller in infants and children, but continues to grow with the child. A giant pigmented nevus is usually larger than 20cm in diameter once it stops growing. They are often found on the buttocks, which is known as "bathing trunk" nevi. Skin cancer (such as malignant melanoma and other types) may develop in up to 15% (1 out of 6) of people with larger or giant nevi, often in childhood. The risk is higher for larger or giant congenital nevi located on the back or abdomen.[1][2]
Last updated: 6/23/2011


  1. Vorvick LJ. Giant congenital nevus. MedlinePlus. October 2010; Accessed 6/23/2011.
  2. Congenital melanocytic naevi. DermNet NZ. June 2009; Accessed 6/23/2011.
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Basic Information

  • DermNet NZ is an online resource about skin diseases developed by the New Zealand Dermatological Society Incorporated. DermNet NZ provides information about this condition.
  • MedlinePlus was designed by the National Library of Medicine to help you research your health questions, and it provides more information about this topic.

In Depth Information

  • Medscape Reference provides information on this topic. Click on the link to view this information. You may need to register to view the medical textbook, but registration is free.
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  • The Online Mendelian Inheritance in Man (OMIM) is an catalog of human genes and genetic disorders. Each entry has a summary of related medical articles. It is meant for health care professionals and researchers. OMIM is maintained by Johns Hopkins University School of Medicine. 
  • Orphanet is a European reference portal for information on rare diseases and orphan drugs.  Access to this database is free of charge.
  • PubMed is a searchable database of medical literature and lists journal articles that discuss Giant congenital nevus. Click on the link to view a sample search on this topic.