Giant congenital nevus
Other Names for this Disease
- Giant pigmented hairy nevus
- Giant pigmented nevus
- Bathing trunk nevus
- Large congenital melanocytic nevus
See Disclaimer regarding information on this site. Some links on this page may take you to organizations outside of the National Institutes of Health.
 Giant congenital nevi can occur in people of any racial or ethnic background and on any area of the body. They result from localized genetic changes in the fetus that lead to excessive growth of melanocytes, the cells in the skin that are responsible for skin color. People with giant congenital nevi may experience a number of complications ranging from fragile, dry, or itchy skin to neurological problems like neurocutaneous melanocytosis (excess pigment cells in the brain or spinal cord). They also have an increased risk of developing malignant melanoma, a type of skin cancer.A giant congenital nevus is a dark-colored, often hairy patch of skin that is present at birth (congenital). It grows proportionally to the child. A congenital pigmented nevus is considered giant if by adulthood it is larger than 20cm (about 8 inches) in diameter.
Last updated: 5/7/2015
- Congenital melanocytic naevi. DermNet NZ. December 2014; http://dermnetnz.org/lesions/congenital-naevus.html. Accessed 3/17/2015.
- Kinsler V, Etchevers H, Price H. All About Congenital Melanocytic Nevi. Naevus Global. http://www.naevusglobal.org/naevus-global-english_id93.html. Accessed 5/4/2015.
- DermNet NZ is an online resource about skin diseases developed by the New Zealand Dermatological Society Incorporated. DermNet NZ provides information about this condition.
- Genetics Home Reference (GHR) contains information on Giant congenital nevus. This website is maintained by the National Library of Medicine.
- MedlinePlus was designed by the National Library of Medicine to help you research your health questions, and it provides more information about this topic.
- The National Organization for Rare Disorders (NORD) has a report for patients and families about this condition. NORD is a patient advocacy organization for individuals with rare diseases and the organizations that serve them.
- Medscape Reference provides information on this topic. You may need to register to view the medical textbook, but registration is free.
Congenital Hairy Nevi - Plastic Surgery
Congenital Nevi - Dermatology
- The Monarch Initiative brings together data about this condition from humans and other species to help physicians and biomedical researchers. Monarch’s tools are designed to make it easier to compare the signs and symptoms (phenotypes) of different diseases and discover common features. This initiative is a collaboration between several academic institutions across the world and is funded by the National Institutes of Health. Visit the website to explore the biology of this condition.
- Online Mendelian Inheritance in Man (OMIM) is a 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.