Skin Tag or Melanoma? How to Tell the Difference

A skin tag (acrochordon) is a small benign outgrowth of skin attached by a narrow stalk (peduncle). Typical size is 1-5mm, though some grow larger. The colour matches the surrounding skin, sometimes slightly darker or pinker.

Skin tags develop in skin folds and friction areas: neck, armpits, under breasts, groin, and eyelids. They are more common with age, in pregnancy, in obesity, with insulin resistance, and in some genetic conditions (Birt-Hogg-Dubé syndrome). Most people develop several over a lifetime.

A real skin tag is soft, painless, hangs from a stalk, and does not change much over time. It can become irritated by clothing or jewellery and turn red or sore briefly, but otherwise it is biologically inert.

Pedunculated (stalked) melanoma. Rare but real. A melanoma that grows outward on a narrow stalk can be mistaken for a darker-than-usual skin tag. Usually has irregular pigmentation, may bleed, and grows over weeks to months.

Basal cell carcinoma (BCC). A small papular BCC, especially on the eyelid or neck, can look like a flesh-coloured skin tag. Distinguishing features: pearly translucent quality, visible small blood vessels, central depression that scabs.

Neurofibroma. A soft flesh-coloured nodule, often pedunculated. Multiple neurofibromas can be a sign of neurofibromatosis. Individual lesions are benign but should be evaluated if numerous or large.

Seborrheic keratosis. A rough brown or tan growth, usually flat or slightly raised, looking 'stuck on' to the skin. Sometimes mistaken for a skin tag if pedunculated. Benign but can darken and become confused with melanoma.

Pedunculated nevus (mole on a stalk). A regular benign mole that has grown into a stalked shape. Almost always benign but should be evaluated if changing.

Skin tag: stable for months or years. Once formed, it does not grow significantly, change colour, or develop new features. The only common change is irritation when clothing or jewellery rubs it.

Suspicious lesion: growing in size; changing colour; developing dark or irregular pigment; bleeding; ulcerating. Any 'skin tag' that has changed in the past 4-8 weeks deserves a dermatologist look.

Skin tag: matches surrounding skin, or slightly pinker, or slightly browner. The colour is uniform across the lesion. There is no black, blue, red, or multi-coloured variation.

Suspicious lesion: dark brown, black, blue, or multi-coloured 'skin tags' need evaluation. The most concerning pattern is a skin tag with mixed colours (brown, black, pink, red in different areas) — this is the C in ABCDE applied to a stalked lesion.

Skin tag: smooth surface, soft and flexible to the touch. The lesion bends and moves when pushed.

Suspicious lesion: rough surface, ulceration, scab, crust, or firmness. A 'skin tag' that feels indurated (firm and unyielding) under your fingertip is not a typical skin tag. Firmness is a feature of cancer because tumours have densely packed cells.

Skin tag: bleeds only when traumatised — caught on jewellery, scraped while drying, etc. Heals normally within days.

Suspicious lesion: bleeds spontaneously, repeatedly, or has small pinpoint bleeding from the surface. A lesion that scabs and re-bleeds in cycles is one of the most reliable warning signs across all skin cancers.

Skin tags: usually multiple. Once you find one, you typically find several others in similar locations. The pattern of multiple similar lesions in friction areas is itself reassuring.

Suspicious lesion: a solitary lesion in an unusual location, or one lesion that is visibly different from your other skin tags (the ugly duckling principle). If you have ten skin tags and one is distinctly different — bigger, darker, growing — that is the one to evaluate.

Standard medical removal options: snip excision with sterile scissors, cryotherapy (freezing), electrocautery (burning), or ligation (tying off the stalk). All are quick, usually painless or minimally painful, and done in a dermatologist or GP office.

Do not remove a skin tag at home, especially with pharmacy 'mole and skin tag' freezing kits or string ligation, if there is any chance the lesion is not actually a benign skin tag. Self-removal destroys the lesion before it can be examined, and if it was a melanoma the tissue is gone. Pathology of removed lesions is the only way to be sure.

If any of the warning signs in this guide are present (dark colour, growth, bleeding, ulceration, firmness, ugly-duckling appearance) — see a dermatologist for excision, not a pharmacy kit. The cost difference is small. The diagnostic difference can be life-changing.