See, Play and Learn
Moles are growths on the skin. They happen when pigment cells in the skin, called melanocytes, grow in clusters. Moles are very common. Most people have between 10 and 40 moles. A person may develop new moles from time to time, usually until about age 40. In older people, they tend to fade away.
Moles are usually pink, tan or brown. They can be flat or raised. They are usually round or oval and no larger than a pencil eraser.
About one out of every ten people has at least one unusual (or atypical) mole that looks different from an ordinary mole. They are called dysplastic nevi. They may be more likely than ordinary moles to develop into melanoma, a type of skin cancer. You should have a health care professional check your moles if they look unusual, grow larger, change in color or outline, or in any other way.
NIH: National Cancer Institute
- Common Moles, Dysplastic Nevi, and Risk of Melanoma (National Cancer Institute) Also in Spanish
- Moles (American Osteopathic College of Dermatology)
- Moles: Overview (American Academy of Dermatology)
- What Does a Mole Look Like? (National Cancer Institute)
Prevention and Risk Factors
- Detect Skin Cancer: Body Mole Map (American Academy of Dermatology) - PDF
Treatments and Therapies
- Nevus Removal (Nevus Outreach, Inc.)
- Products Marketed for Removing Moles and Other Skin Lesions Can Cause Injuries, Scarring (Food and Drug Administration) Also in Spanish
- Treatment Options for Congenital Pigmented Nevus (Nevus Outreach, Inc.)
- Psychological Challenges Associated with Congenital Melanocytic Nevus (CMN) (Nevus Outreach, Inc.)
- Birthmarks (Nemours Foundation) Also in Spanish
- Atypical Moles (American Osteopathic College of Dermatology)
- Frequently Asked Questions about Congenital Melanocytic Nevus (CMN) (Nevus Outreach, Inc.)
- Atypical Nevus (VisualDX)
- Mole (Nevus) (VisualDX)
- ClinicalTrials.gov: Nevus (National Institutes of Health)
Journal Articles References and abstracts from MEDLINE/PubMed (National Library of Medicine)
- Article: Skin cancer-related conditions managed in general practice in Australia, 2000-2016: a...
- Article: Standardized Computer-Assisted Analysis of PRAME Immunoreactivity in Dysplastic Nevi and Superficial...
- Article: Nevus Count, Pigmentary Characteristics, and Melanoma-specific Mortality among Norwegian Women with...
- Moles -- see more articles
Find an Expert
- American Academy of Dermatology
- Find a Dermatologic Surgeon (American Society for Dermatologic Surgery)
- Find a Dermatologist (American Academy of Dermatology)
- National Cancer Institute Also in Spanish
- National Institute of Arthritis and Musculoskeletal and Skin Diseases Also in Spanish
- Nevus, Congenital Melanocytic (VisualDX)
- Birthmarks - pigmented (Medical Encyclopedia) Also in Spanish
- Giant congenital nevus (Medical Encyclopedia) Also in Spanish
- Skin self-exam (Medical Encyclopedia) Also in Spanish