Moles are ordinary clusters of pigment cells in the skin, and almost all of them stay harmless for a whole lifetime. What matters is not how many you have, but whether one of them is changing - because a changing mole is the earliest sign of melanoma, and the earliest melanoma is the one that is easiest to cure. A seborrheic keratosis is a common, harmless growth that looks stuck onto the skin, like a piece of wax or a small barnacle. They are not cancer and they do not become cancer. The reason to see a doctor is to be sure that is what you are looking at.
The same eight facts on every condition comparison.
They are clusters of pigment cells.
Moles are usually benign collections of melanocytes.
They vary in appearance.
They can be flat or raised, skin-colored or pigmented.
They appear at different times.
Some are present at birth; others appear later.
New or changing moles need a check.
A stable familiar mole differs from an evolving lesion.
It is a benign growth.
Surface skin cells form a waxy, warty or stuck-on growth.
Color varies.
It can be tan, brown, gray or almost black.
It is not a precancer.
These growths become more common with age.
Uncertain lesions are tested.
Tissue is examined before any destructive treatment if the appearance is unclear.
Common mole Small, round, even color.
Atypical mole Larger, uneven border or color.
Congenital mole Present from birth.
Halo nevus Generated illustration. Mole surrounded by a pale ring.
Blue nevus Small blue-gray mole.
Classic seborrheic keratosis Raised, waxy, stuck-on growth.
Stucco keratosis Small white-gray bumps on the legs.
Dermatosis papulosa nigra Small dark bumps on the face.
Moles form when benign pigment cells cluster into small nests. The location and arrangement of these cells help explain why some moles are flat and others are raised.
A benign overgrowth of surface skin cells creates a localized plaque. Keratin and sometimes pigment collect in the growth, giving it a waxy, rough or stuck-on appearance.
Moles. Most ordinary moles appear during childhood and adolescence; new or changing adult lesions deserve attention.
Seborrheic Keratosis. Usually appears in adult life and becomes increasingly common with age.
Moles form when pigment cells grow in a cluster instead of spreading through the skin. Most appear in childhood and early adulthood.
Seborrheic keratoses are harmless growths of skin cells that become more common with age.
The number of moles you have is largely inherited.
They often run in families.
Evidence labels come from each condition’s own treatment list.
A strong urea cream can soften and flatten the rough white growths that scatter over the lower legs, called stucco keratoses, if the roughness is what bothers you. It smooths the surface rather than removing the growth, and it has to be used continuously. It does nothing for thick, dark, stuck-on growths elsewhere.
Wart treatments are often tried on these because the surface looks similar. Salicylic acid can thin the rough top layer, but it does not clear the growth, and it irritates the normal skin around it. The bigger problem is that it is usually being used on something nobody has examined.
This is aftercare, not treatment. A thin layer of plain petroleum jelly over a treated spot keeps the scab soft and gives the neatest healing, under a small dressing rather than an adhesive strip. It does nothing to a growth that is still there.
Daily mineral sunscreen over a spot that has just been treated stops the temporary mark from darkening and helps it fade faster, which matters most on the face, chest and hands. It will not remove a growth or stop new ones forming. Sun is only one of several things that drive these, and age and family history matter more.
A high-strength peroxide solution applied in clinic was approved for raised growths on the face and body. It cleared some growths, often needed repeat visits, and commonly caused stinging, crusting and pigment change. It was withdrawn from sale in the United States, so in practice removal is done by hand rather than with a liquid.
The standard for any mole that is genuinely in doubt: the whole mole is cut out under local anesthetic with a narrow margin of normal skin and sent for examination under a microscope. Taking all of it matters, because the pathologist has to see the full depth and the edges. It leaves a line scar, and results come back in a week or two.
A raised mole that catches on a razor or a collar can be shaved off flush with the skin under local anesthetic, leaving a flat pale mark rather than a line scar. It is a reasonable choice for a mole that is not suspicious, and the tissue still goes to the laboratory. Two honest limits: pigment left at the base can grow back, and a shave through a melanoma cuts across it rather than under it.
A small circular blade removes a small mole whole, down through the full thickness of the skin, and it is closed with a stitch or two. It suits moles smaller than the punch. Used to take a sample from part of a larger suspicious mole it can under-read the depth, so for those an excision is the better choice.
The growth is numbed and shaved off level with the skin in a few seconds. It is the method of choice when there is any question about what a growth is, because it produces tissue that can be sent to the laboratory. It leaves a flat mark that fades over months, and it does not stop new growths appearing elsewhere.
The growth is scraped off with a small curette and the base sealed with a fine electric tip. It is controlled and shallow, which is why it is often preferred for small facial growths and for the dark facial growths common on deeper skin tones. Scraping first still gives tissue that can be examined if there is doubt.
A few seconds of liquid nitrogen makes flatter growths blister and lift off over a week or two, and it is the quickest way to treat several at once. It destroys the growth, so nothing can be examined afterward, which is why it is not used on anything with a question attached. It is used cautiously on the face and on deeper skin tones, because the pigment cells are sensitive to cold and it can leave a pale spot.
An ablative laser can vaporise a growth precisely and is sometimes used when several need treating on the face. Like freezing, it destroys the tissue, so it is only for growths already confirmed as harmless. It is the most expensive of the options and it is not better than a curette for a single growth.
When a growth is changing, bleeding on its own, or simply looks unlike your others, part or all of it is taken after numbing and examined under a microscope. It is the only way to be certain, and the threshold for doing it is deliberately low, because the cost of a small biopsy is trivial next to missing a melanoma. An irritated growth is one of the commonest reasons a benign growth ends up being sampled.
Most moles remain harmless, but their appearance can change over a lifetime. A changing mole, a new unusual pigmented spot or one that looks different from the others needs examination. Monitoring should follow the person's individual risk.
Seborrheic keratoses appear slowly, change slowly, then stay. Two departures deserve attention: one growth that starts changing - growing, darkening, bleeding on its own, or itching persistently - and a sudden crop of many new ones over weeks to months.
Most moles are benign. Having many or atypical moles can mark increased melanoma risk, and a changing lesion should be examined rather than assumed to be an ordinary mole.
Catching on clothing makes it flare
A growth caught by clothing, a strap or a waistband can turn red, swollen, itchy, crusted or sore, and can bleed. That is an irritated seborrheic keratosis. It settles, but it looks alarming and often prompts removal or a sample.
Arrange prompt assessment for an evolving, unusual or bleeding mole. Comparing a spot with your other moles is useful, but photographs cannot confirm a diagnosis.
Have a new, changing, bleeding or uncertain growth assessed; skin cancer can sometimes resemble a harmless stuck-on growth.
Use two checks together. ABCDE covers asymmetry, an uneven border, more than one color, a diameter above about 6 millimeters, and - most important - evolving, meaning changing. The ugly duckling check asks whether the mole looks like your others. A spot that fails either, or passes both but keeps changing, should be examined in person.
New moles keep appearing through the teens and twenties and become uncommon after about 40. Many new pigmented spots in older adults turn out to be seborrheic keratoses or sun spots. That is a reason to have a new spot identified, not to assume it is one of those.
Yes, and it is a reasonable request. What matters is how it is done — cut out under local anesthetic and sent to a laboratory. Lasering, freezing or burning leaves nothing to examine, so ask for the version that gets checked.
No. Your risk is higher than average and regular checks are worth doing, but most people with a high mole count never develop melanoma. The response is a schedule of skin exams, not worry.
Yes — most melanomas arise on skin that had no mole before. That is why a new spot that grows, or a sore that will not heal, deserves the same attention as a changing mole.
Moles commonly darken slightly in pregnancy, and skin stretching over a growing abdomen or breasts can change a mole's shape. Melanoma does occur in pregnancy, though. A mole that changes in shape, border or color should be looked at while you are pregnant, not after.
It could be, which is why it should be looked at rather than diagnosed at home. Melanoma is sometimes mistaken for a seborrheic keratosis, and a dermatoscope resolves most of these in seconds. The concerning features are change in size, shape or color, bleeding without being knocked, an irregular edge, and a growth unlike your others. Book rather than watch.
Age and family history account for nearly all of it. They accumulate steadily from the forties onward, and someone whose parents had many will develop many. A genuinely sudden crop over weeks to months, especially with itching, is different and worth examining.
No. Removal deals with that growth, not the age and inherited tendency behind it, so new ones can keep appearing elsewhere. That is expected, not a failed removal.
Often, at least for a while. A flat spot darker or paler than nearby skin is common, and dark marks usually fade over months. Pale marks can be permanent and are more noticeable on deeper skin tones, so ask about the method and do a test spot before treating a large area. Daily sunscreen on the treated spot makes a real difference.
Most likely it caught on clothing, a strap or a razor and became an irritated seborrheic keratosis. They look far worse than they are and they settle. Still have it looked at - an irritated growth is one of the harder ones to be sure about by appearance, and a growth that bled with nothing catching it is a different question.
As many as you and your doctor think sensible, usually in sessions rather than all at once. It is normally considered cosmetic, so ask about cost first. On the face, and particularly on deeper skin tones, start with a small test area and see how it heals.
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