Navigate Up

Pediatric Center - A-Z Index

#
Q
Z

Print This Page

Giant congenital nevus

A congenital pigmented or melanocytic nevus is a dark-colored, often hairy patch of skin. A congenital nevus is present at birth or appears in the first year of life. 

A giant congenital nevus is smaller in infants and children, but it usually continues to grow as the child grows. A giant pigmented nevus is larger than 8 inches once it stops growing.

Alternative Names

Congenital giant pigmented nevus; Giant hairy nevus; Giant pigmented nevus; Bathing trunk nevus; Congenital melanocytic nevus - large

Causes, incidence, and risk factors

These marks are thought to be caused by problems that develop as a baby grows in the womb. In some families bathing trunk nevi may be inherited.

The condition may occur with:

Smaller congenital pigmented or melanocytic nevi are common in children and do not cause problems most of the time. Larger or giant nevi are rare.

Symptoms

A nevus will appear as dark-colored patch with any of the following:

  • Brown to bluish-black color
  • Hair
  • Regular or uneven borders
  • Small satellite areas (maybe)
  • Smooth, irregular, or wart-like skin surface

Nevi are commonly found on the upper or lower parts of the back or the abdomen. They may also be found on the:

  • Arms
  • Legs
  • Mouth
  • Mucus membranes
  • Palms or soles

Signs and tests

You should have all birthmarks looked at by a health care provider. A skin biopsy may needed to check for cancer cells. 

An MRI of the brain might be done if the nevus is over the spine. A giant nevus on the spine may be linked to brain problems.

Your doctor will measure the dark skin area every year and take pictures to check if the spot is getting larger.

Treatment

You will need to have regular exams to check for skin cancers.

Surgery to remove the nevus is be done if possible. Skin grafting is also done when needed. Larger nevi may need to be removed in several stages.

Lasers and dermabrasion can also be used to improve the appearance. These treatments may not remove the whole birthmark, so it may be harder to for the doctors to detect skin cancer (melanoma). Talk to your doctor about the pros and cons of surgery in your case.

Treatment may be helpful if the birthmark causes emotional problems because of how it looks. 

Expectations (prognosis)

Skin cancer may develop in about 1 in 6 people with large or giant nevi. The cancer risk is higher for nevi located on the back or abdomen. 

Complications

  • Depression and other emotional problems if the nevi affect appearance
  • Skin cancer (melanoma)

Calling your health care provider

This condition is usually diagnosed at birth. Talk to your child's doctor if your child has a large pigmented area anywhere on the skin.

References

Congenital melanocytic nevi. In: Habif TP, ed. Clinical Dermatology. 5th ed. Philadelphia, Pa: Saunders Elsevier; 2009:pp 850-851.
Melanocytic Nevi and Neoplasms. In: James WD, Berger TG, Elston DM, eds. Andrews' Diseases of the Skin: Clinical Dermatology. 11th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 30.



 

Updated: 11/20/2012

Kevin Berman, MD, PhD, Atlanta Center for Dermatologic Disease, Atlanta, GA. Review provided by VeriMed Healthcare Network. Also reviewed by A.D.A.M. Health Solutions, Ebix, Inc., Editorial Team: David Zieve, MD, MHA, David R. Eltz, Stephanie Slon, and Nissi Wang.


©  UPMC | Affiliated with the University of Pittsburgh Schools of the Health Sciences
Supplemental content provided by A.D.A.M. Health Solutions. All rights reserved.

For help in finding a doctor or health service that suits your needs, call the UPMC Referral Service at 412-647-UPMC (8762) or 1-800-533-UPMC (8762). Select option 1.

UPMC is an equal opportunity employer. UPMC policy prohibits discrimination or harassment on the basis of race, color, religion, ancestry, national origin, age, sex, genetics, sexual orientation, marital status, familial status, disability, veteran status, or any other legally protected group status. Further, UPMC will continue to support and promote equal employment opportunity, human dignity, and racial, ethnic, and cultural diversity. This policy applies to admissions, employment, and access to and treatment in UPMC programs and activities. This commitment is made by UPMC in accordance with federal, state, and/or local laws and regulations.

Medical information made available on UPMC.com is not intended to be used as a substitute for professional medical advice, diagnosis, or treatment. You should not rely entirely on this information for your health care needs. Ask your own doctor or health care provider any specific medical questions that you have. Further, UPMC.com is not a tool to be used in the case of an emergency. If an emergency arises, you should seek appropriate emergency medical services.

For UPMC Mercy Patients: As a Catholic hospital, UPMC Mercy abides by the Ethical and Religious Directives for Catholic Health Care Services, as determined by the United States Conference of Catholic Bishops. As such, UPMC Mercy neither endorses nor provides medical practices and/or procedures that contradict the moral teachings of the Roman Catholic Church.

© UPMC
Pittsburgh, PA, USA UPMC.com