Moles (Nevi) - Symptoms, Causes & Treatment
By ScanSkinAI Editorial Team✓ Reviewed for medical safetyLast updated June 2026
Common skin growths made up of pigment-producing cells. Most moles are harmless, but changes in a mole can indicate melanoma.
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Quick Answer
Moles, or nevi, are common skin growths formed by clusters of pigment-producing cells. Most adults have between 10 and 40 moles. They are usually round, uniformly coloured, and can be flat or raised. While the vast majority are completely harmless and require no treatment, you should always monitor them. Changes in a mole's size, shape, or colour can occasionally be an early warning sign of skin cancer. Checking your skin regularly and visiting a doctor for any evolving spots is the best way to ensure your skin stays healthy.
Clinical Context
Moles (melanocytic nevi) are benign proliferations of melanocytes, the pigment-producing cells of the skin. Most adults have 10-40 moles. They typically appear in childhood and adolescence, and may change or fade with age. Types include junctional (flat, at skin-surface junction), compound (slightly raised), and intradermal (raised, often flesh-colored). While most moles are harmless, melanoma can arise from existing moles or appear as new atypical lesions. Regular self-examination using the ABCDE criteria is essential for early melanoma detection.
Symptoms
- Brown, tan, or black spots
- Round or oval shape
- Flat or raised
- May have hair
- Usually uniform color
Severity & Progression
Causes & Risk Factors
- Clusters of melanocytes
- Sun exposure
- Genetics
- Develop from childhood through middle age
Treatment & Management
Most moles require no treatment. Regular self-examination and annual skin checks by a dermatologist are recommended, especially for those with many moles or risk factors. Suspicious moles are removed and biopsied - shave biopsy for raised lesions, excisional biopsy for flat or atypical lesions. Cosmetically bothersome moles can be surgically removed. Laser removal is not recommended as it prevents histologic examination. Moles removed for cosmetic reasons may leave a scar.
- Most need no treatment
- Regular monitoring
- Surgical removal if suspicious
- Biopsy if concerning
Red Flags & Complications
Seek medical attention if you experience any of the following:
- Melanoma (rare but serious)
- Irritation from friction or shaving
- Cosmetic concerns
- Anxiety about changes in moles
Self-Care Tips
- Perform monthly skin self-exams
- Use the ABCDE rule: Asymmetry, Border, Color, Diameter, Evolving
- Take photos to track changes over time
- Protect skin from sun to prevent new moles
- Don't try to remove moles at home
- Schedule annual dermatology skin checks if you have many moles
When to See a Doctor
If a mole changes (ABCDE: Asymmetry, Border, Color, Diameter, Evolving)
Frequently Asked Questions
Why do people get moles?
Moles form when melanocytes—the cells responsible for producing skin pigment—grow in clusters rather than spreading evenly across the skin. Your genetics play a large role in how many moles you develop. Additionally, significant sun exposure, particularly during childhood and adolescence, heavily influences the number of moles that appear on your body over time.
What are the warning signs that a mole might be dangerous?
Dermatologists recommend the ABCDE rule to spot warning signs. Look for Asymmetry (one half doesn't match the other), irregular Borders, uneven Colour, a Diameter larger than 6 millimetres (about the size of a pencil eraser), and Evolving features. If a mole is changing in size, shape, colour, or starts bleeding or itching, you should have it evaluated immediately.
Do I need to get my moles removed?
Most moles are completely harmless and do not need to be removed. However, if a mole shows suspicious changes or irregular features, a doctor will perform a biopsy or surgically remove it to check for cancer. Sometimes people choose to have benign moles removed for cosmetic reasons or because they frequently catch on clothing, though this will usually leave a small scar.
Can I try to remove a bothersome mole at home?
You should never attempt to remove a mole at home using razors, scissors, or over-the-counter creams. Doing so can cause severe infection, significant scarring, and bleeding. More importantly, DIY removal destroys the tissue, meaning a doctor cannot test it to ensure it was not cancerous. Always have a qualified medical professional assess and safely remove any mole.
Can a normal mole turn into skin cancer?
Most moles remain harmless for your entire life. However, a small percentage can undergo changes and develop into melanoma, a serious type of skin cancer. Melanoma can also appear as a completely new, unusual spot on the skin. This is why regular self-examinations are so important. Catching and removing a changing mole early leads to a very high success rate.
What is the difference between a typical mole and an atypical mole?
A typical mole is usually small, round, and an even brown or tan colour. An atypical mole, or dysplastic nevus, often looks slightly irregular. It might be larger, have fuzzy borders, or contain different shades of colour. While atypical moles are not cancer, having many of them means you have a higher risk of developing melanoma and should be closely monitored by a dermatologist.
How can ScanSkinAI help me keep track of my moles?
ScanSkinAI helps you confidently document and track the appearance of your moles over time. By frequently photographing your spots, the tool can help highlight subtle changes in a mole’s size, border, or colour. Please remember that ScanSkinAI is strictly a visual screening aid to assist with your self-exams, not a diagnostic tool. Always consult a healthcare professional for a medical diagnosis.
When should I see a doctor about a mole?
You should schedule an appointment with a doctor or dermatologist if you notice any mole rapidly changing, itching, bleeding, or looking significantly different from your other moles. Those with a family history of skin cancer, many atypical moles, or an unusually high number of standard moles should also consider scheduling an annual full-body skin check as a precaution.
Related Conditions
Medical References
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Medical Disclaimer: This information is for educational purposes only and is not intended as medical advice. The content on this page should not be used to diagnose or treat any health problem. Always consult with a qualified healthcare professional for proper medical evaluation, diagnosis, and treatment of your condition.