Home Health Topics Health Reports Learning Centers Find a Dermatologist Medical Website Design

Congenital Mole (Nevus) Overview, Cause

Overview of Congenital Moles

Congenital nevi appear on approximately 1% of newborns. A congenital nevus (plural is nevi) is a mole that is present at or develops shortly after birth. A distinction is made between small and giant nevi.

Article Continues Below

Traditionally, a giant congenital nevus is greater than 20 centimeters (cm) in diameter, while a small nevus is less than 1.5 cm. A more practical classification has been suggested, depending on the ease of surgical removal and the anatomic location of the mole. For example, a nevus that cannot be easily stitched and may require a graft after removal is considered large. Similarly, a nevus that occupies a significant proportion of one anatomic area, such as the neck or an extremity, would be considered large. On the other hand, a nevus that can be removed relatively simply or that occupies a minor portion of an anatomic area is considered small.

Cause of Congenital Moles

Familial tendencies exist. Approximately 1 in 20,000 newborns is found to have a large congenital nevus. Melanocytes (pigment-producing skin cells) are found in utero at about 40 days gestation, and it is thought that congenital nevi develop between the 2nd and 6th months of gestation.

Physician-developed and -monitored.
Original Date of Publication: 01 Sep 2000
Reviewed by: Stanley J. Swierzewski, III, M.D.
Last Reviewed: 04 Dec 2007

©, Inc. All Rights Reserved.

More on Moles (6 of 13 articles)

Congenital Mole (Nevus) Signs and Symptoms

Read More »

  • Jon Lovitz Gets Serious About Psoriasis
  • How to Control Psoriasis This Winter
  • New Cholesterol Drug Shows Great Potential
  • Study Slams Dosing Instructions for Childhood Medicines
  • Kids Enjoy Low-Sugar Cereals, Study Finds
  • Alpha-Carotene Linked to Longevity, Study Suggests
  • Higher Risk of ADHD in Children with High Blood Pressure
  • New Discovery Assists in Cancer Research
  • Can Probiotics Help Kids With Upset Stomachs?
  • Could Feeding Infants Formula Help Prevent Type 1 Diabetes?
  • Race, Gender and Location Influence Risk of Hypertension
  • FDA Approves New Drug for Late-Stage Breast Cancer
  • Study Compares Treatment Options for Women With DCIS
  • Diabetes and Depression: A Two-Way Street
  • Study Finds Common Chemicals May Hinder Immune Functioning
  • Tricyclic Antidepressants Linked to Cardiovascular Disease
  • Rates of Some Sexually Transmitted Diseases Rising, CDC Reports
  • Prostate Cancer Treatment May Promote Colorectal Cancer
  • Secondhand Smoke Kills Over 600,000 Annually
  • Smoking Increases Risks of Rheumatoid Arthritis Among African Americans
  • Frequently Asked Questions F... (37)
  • Common Acquired Moles - Diagn... (37)
  • Common Acquired Moles - Overv... (37)
  • Halo Nevus (37)
  • Dysplastic Nevus - Treatment,... (37)
  • Congenital Nevus - Treatment (37)
  • Congenital Nevus - Diagnosis (37)
  • Congenital Nevus - Signs and ... (37)
  • Spitz Nevus (37)
  • Dysplastic Nevus - Overview, ... (37)



Alternative Medicine

Animal Health

Avian Flu







General Health


LGBT Health

Male Health

Mental Health





Pediatric Health





Senior Health

Sexual Health

Sleep Disorder




Women's Health

This website is certified by Health On the Net Foundation. Click to verify.This site complies with the HONcode standard for trustworthy health information:
verify here.

This page last modified: 14 Sep 2010

Remedy Health Media logo
Magazines: Diabetes Focus® | MediZine's Healthy Living™ | Remedy® | RemedyKids™ | RemedyMD™
Websites:® | RemedyLife™ | | |
© 2010 Remedy Health Media, LLC. All rights reserved.