How should I examine my skin for moles?

How should I examine my skin for moles?

Overview

A skin mole, or melanocytic naevus, is a usually harmless cluster of melanocytes, the pigment-producing cells that make melanin. Moles may be flat or raised, smooth or slightly rough, and can be brown, black, pink, skin-coloured or a mixture of shades. Some are present from birth, while many appear during childhood, teenage years or early adult life.

Most moles are benign and do not need treatment. The important safety point is change. Melanoma, a serious type of skin cancer, can sometimes look like a new mole or an existing mole that has altered in size, shape, colour, surface or sensation. That is why a mole article should cover more than a short checklist: readers need to know how moles form, what changes matter, when to seek assessment, how clinicians investigate suspicious lesions, and why home removal is unsafe.

Skin checking should be inclusive. Melanoma and other suspicious pigmented lesions can occur on darker skin, under nails, on palms or soles, and on areas that are not often exposed to the sun. A useful check looks at the whole skin surface and compares each mark with the person’s own usual pattern.

How to examine your skin for moles

Choose good light and check the whole skin surface, including the scalp, ears, neck, back, buttocks, backs of legs, soles, between toes and under nails. Use a full-length mirror, a hand mirror and help from someone you trust for areas you cannot see well. Take dated photographs of moles you are watching.

Look for asymmetry, irregular border, uneven colour, growth and evolution, but also trust your sense that something is new or different. Self-checking is useful for noticing change; it is not a way to diagnose melanoma at home. If a mole is changing or difficult to judge, arrange medical review.

How moles form

Melanocytes normally sit among other cells in the top layers of the skin. In a mole, these melanocytes grow together in a cluster, creating a visible mark. The amount and pattern of melanin within the cluster influences whether the mole looks tan, brown, black, pink or skin-coloured.

Genes strongly influence how many moles someone develops and what they look like. Ultraviolet radiation from sunlight or sunbeds can also affect pigment cells and surrounding skin. UV exposure can damage DNA inside skin cells; repeated damage is one reason sun protection is important even when a person already has many long-standing moles.

Moles can change slowly through life. They may become raised, develop a hair, fade, or look slightly different as the skin ages. Slow and symmetrical change can be benign, but it is not always possible to judge safely at home. Sudden change, uneven change, or a mole that looks unlike the rest should be assessed.

Symptoms and warning changes

Many harmless moles are evenly coloured, round or oval, stable and similar to a person’s other moles. Warning changes include asymmetry, an irregular or blurred border, several colours within one lesion, rapid growth, a new dark or black area, bleeding, crusting, persistent itch, pain, inflammation without an obvious injury, or a sore that does not heal.

The ABCDE pattern can help: asymmetry, border irregularity, colour variation, diameter or size change, and evolution over time. The final point, evolution, is often the most practical because change is what prompts many people to seek help. Also pay attention to an ‘ugly duckling’ mole that looks different from the surrounding pattern of moles.

Do not rely on diameter alone. Some concerning lesions are small, and some larger moles are harmless. New pigment under a nail, a changing lesion on the sole of the foot, or a mole on genital or mucosal skin should not be ignored simply because it is not in a sun-exposed place.

Risk factors and prevention

Risk is higher in people with many moles, atypical-looking moles, fair or easily burning skin, a history of severe sunburn, frequent ultraviolet exposure, previous sunbed use, a personal history of melanoma, or a close family history of melanoma. People with a weakened immune system may also need a lower threshold for medical advice.

Prevention does not mean removing every mole or trying to stop all new moles. It means reducing avoidable UV damage and noticing change early. Practical steps include spending time in shade when UV levels are high, wearing protective clothing and sunglasses, using broad-spectrum sunscreen correctly, reapplying it as directed, and avoiding sunbeds.

People who have many moles may benefit from a more deliberate monitoring routine, such as dated photographs or professional advice on how often to review their skin. The right interval depends on personal risk and clinical judgement; it should not be invented or treated as the same for everyone.

Diagnosis and medical assessment

A GP will usually ask when the mole appeared, what has changed, whether it bleeds, crusts, itches or hurts, and whether there is any history of melanoma or significant sun exposure. They may examine the mole, compare it with the rest of the skin and decide whether referral is needed.

A dermatologist may use dermoscopy, a magnified light-based examination that shows structures not easily visible to the naked eye. If a mole has features that could suggest melanoma, NICE guidance supports urgent referral through suspected cancer pathways so it can be assessed promptly.

When melanoma is suspected, the usual diagnostic step is removal of the whole suspicious lesion with a margin of normal-looking skin so a laboratory can examine it under a microscope. This histology result is what confirms the diagnosis and helps guide next steps. Online photographs, apps and home checks cannot replace this clinical pathway.

Treatment, removal and self-care

Most moles need no treatment. Removal may be considered when a mole is suspicious, repeatedly traumatised, hard to monitor, or causing significant practical or cosmetic concern. Suitability is confirmed after consultation because the safest method depends on the mole’s appearance, depth, site and reason for removal.

Clinical removal may involve excision, shave removal or another technique in selected benign cases. If there is any concern about melanoma, the approach must preserve tissue for histology. Cosmetic removal should never override diagnostic safety, and a practitioner should explain scarring, infection, bleeding, aftercare and whether the sample will be sent for laboratory testing.

Self-care means protecting skin, avoiding irritation and seeking assessment when needed. Do not cut, pick, burn, freeze, tie off or apply corrosive products to a mole. At-home treatments can injure skin, cause scarring, mask warning signs and delay diagnosis.

When to seek medical advice

Contact a GP promptly if a mole is new and unusual, changing shape or colour, getting larger, bleeding, crusting, painful, persistently itchy, inflamed without a clear reason, or not healing. Also seek advice if one mole looks different from the rest, if you have many moles and cannot monitor them confidently, or if you have a personal or family history of melanoma.

Use NHS 111 for urgent advice if a skin change is rapidly worsening, infected, very painful, bleeding heavily or you are unsure how quickly you need help. Call 999 in a life-threatening emergency. Most mole concerns are managed through GP, dermatology and suspected cancer referral routes, but severe illness or uncontrolled bleeding should not wait.

Sources

• NHS, Moles: https://www.nhs.uk/conditions/moles/
  Relevance: NHS guidance explains common mole appearances, warning changes, self-checking and when to contact a GP.
• NHS, Melanoma skin cancer: https://www.nhs.uk/conditions/melanoma-skin-cancer/
  Relevance: NHS guidance supports the safety advice on melanoma warning signs, assessment and treatment pathways.
• NICE NG12, Suspected cancer recognition and referral – skin cancers: https://www.nice.org.uk/guidance/ng12/chapter/Recommendations-organised-by-site-of-cancer#skin-cancers
  Relevance: NICE provides UK referral criteria for suspicious pigmented skin lesions and possible melanoma.
• British Association of Dermatologists, Melanoma: bad.org.uk guidance page link unavailable during validation (bad.org.uk guidance page, link unavailable during validation)
  Relevance: BAD provides dermatologist-reviewed patient information on melanoma signs, risk factors and clinical care.
• Mayo Clinic, Moles – symptoms and causes: mayoclinic.org guidance page link unavailable during validation (mayoclinic.org guidance page, link unavailable during validation)
  Relevance: Mayo Clinic provides the comparable condition-page benchmark for symptom, cause, risk and prevention depth.
• NHS, Sunscreen and sun safety: https://www.nhs.uk/live-well/seasonal-health/sunscreen-and-sun-safety/
  Relevance: NHS sun safety guidance supports the ultraviolet protection and prevention advice.

Disclaimer

Educational only. Results vary. Not a cure. Use NHS 111 for urgent advice if symptoms are severe, sudden or worrying. Call 999 in a life-threatening emergency.