What is a mole
A mole, medically called a melanocytic nevus, is a cluster of pigment-producing cells (melanocytes). Moles can be flat or raised, smooth or slightly bumpy, light tan to dark brown to black, and the color is usually uniform across the lesion.
Most adults have between 10 and 40 moles. They develop through childhood and adolescence, are mostly stable in mid-adulthood, and slowly fade or disappear in older age. New moles after age 30, sudden changes in an existing mole, and moles that look meaningfully different from the rest are the ones that matter most for tracking.
- Pigment-cell origin (melanocytes)
- Usually 2-6 mm at maturity, uniform color
- Can be flat or raised; both are normal
- Stable shape over years in adulthood
What is a freckle
A freckle (ephelis) is a small flat spot of localized pigment increase, usually 1-3 mm, light brown to tan, found mostly on sun-exposed skin (face, shoulders, forearms). Freckles are not collections of extra cells — the number of pigment cells is normal, they just make more pigment in response to UV exposure.
Freckles darken with sun exposure and fade in winter. Children with fair skin commonly develop seasonal freckles that come and go. Freckles are not precancerous. Solar lentigines (sometimes called sun spots or age spots) are similar-looking but a separate entity — they are darker, larger, and do not fade with reduced sun.
- Always flat
- 1-3 mm, light brown to tan, uniform color
- Concentrated on sun-exposed skin
- Darken with summer sun, fade in winter
What is a skin tag
A skin tag (acrochordon) is a small soft outpouching of skin, usually on a thin stalk. Skin tags are most common in skin folds (neck, armpits, groin, under breasts) and on the eyelids. They are flesh-colored to slightly darker, soft, and movable on their stalk.
Skin tags are not pigmented lesions and not melanocytic. They are not precancerous. They can get caught by jewelry or clothing and bleed easily; people often remove them for cosmetic or comfort reasons, but they are not medically required to remove.
- Soft fleshy outpouching, usually on a stalk
- Most common in skin folds
- Flesh-colored or slightly darker
- Movable on its stalk; bleeds easily if caught
Side-by-side comparison
Quick visual triage: flat + uniform brown = probably a mole or freckle (mole if usually present, freckle if appears with sun); raised pigmented lesion = mole; soft fleshy outpouching = skin tag.
- Mole: pigment-cell cluster, flat or raised, 2-6 mm, stable
- Freckle: pigment-increase spot, always flat, 1-3 mm, fades in winter
- Skin tag: soft fleshy outpouching, stalked, flesh-toned, friction zones
Which ones to track and which to ignore
Moles deserve tracking. New moles after age 30, moles that have changed in size or color, moles that look different from your other moles, and any mole with the ABCDE features should be photographed and dated.
Freckles do not need to be tracked individually. They come and go with sun exposure. If a single 'freckle' grows, darkens, or persists into winter, it may not be a freckle — that is the case to photograph and to evaluate.
Skin tags do not need to be tracked. They can be removed cosmetically by a clinician. If a 'skin tag' rapidly grows, bleeds without trauma, or hardens, get it looked at — some benign-looking outpouchings are actually fibromas, dermatofibromas, or rarely something else.
Frequently asked questions
Can a freckle turn into a mole?
No. They are different things. A 'freckle' that thickens and persists may have been an early mole or a lentigo, not a true freckle.
Are skin tags dangerous?
No, they are benign. They are removed for comfort or cosmetic reasons, not medical necessity. A rapidly changing or bleeding 'skin tag' that does not behave normally should be checked.
How do I track all my moles?
Use a mole tracking app like DermaTrack: photograph each mole, place it on a body map, and repeat photos at 1-3 month intervals.
My child has new freckles — should I worry?
Freckles in children with fair skin are common and not concerning. New moles in childhood are also normal. Sudden change in an existing mole is the signal that deserves attention, not freckle count.