What causes skin tags? Mostly friction: these soft, harmless growths form where skin rubs against skin, clothing or jewelry, which is why they gather on the neck, under the arms, on the eyelids and in the groin. Extra weight, pregnancy, a family tendency, and diabetes or insulin resistance all make them more likely. They are not moles or warts, and they need no treatment unless they bother you. A growth that bleeds, changes, hurts or arrives suddenly in large numbers goes to a doctor first.
What Causes Skin Tags: Friction, Skin Folds and Time
Doctors call them acrochordons. The UK’s National Health Service (NHS) is candid in its page on skin tags: “the cause of skin tags is not always known, but they are sometimes caused by skin rubbing against skin.” The American Academy of Dermatology (AAD), in its guide to why skin tags develop, says they “usually develop where skin has been rubbing against skin, jewelry, or clothing for some time.”
Note “for some time”: the rubbing that matters is repeated, on the same patch of skin. Age plays a part too. Our page on removing benign skin tags calls them “extremely common, particularly as people get older,” and says they “tend to multiply slowly over the years.” For what else shifts with age, see our guide to how skin changes decade by decade.
The NHS says tags range from around 2 mm to 5 cm, alone or in a large group. Neither the NHS nor the AAD lists poor hygiene or an infection among the causes.
Why Skin Tags Grow on the Neck, Underarms and Eyelids
Find where skin folds or something rubs, and you have found the usual places. The NHS lists the neck, under the arms, the eyelids, under the breasts and around the bottom; the AAD adds the groin, sides, abdomen and back.
- Neck. The AAD names “neck creases (or where clothing or jewelry rubs against the neck).” It is where tags are most often a nuisance: our treatment page says most people have them removed “because they catch on jewelry and collars.”
- Underarms and under the breasts. Skin moves on skin with every swing of the arm; our page also names “along the bra line.”
- Eyelids. Both lists include them, and this is the tag most likely to need a doctor rather than a spa. The AAD counts a tag that develops on the eyelid and affects your eyesight among those that need removing, and our page says areas very close to the eye “may be better referred to a doctor.”
The AAD notes that a tag which “frequently rubs against jewelry, clothing, or a seat belt” can become irritated, as can one you nick while shaving; in Saigon, read helmet strap for seat belt. If you shave your neck, our men’s grooming guide to shaving without irritation says to stay with the grain there; go around a tag, not over it.
Weight, Pregnancy and Family: Who Gets More Skin Tags
The NHS says anyone can get skin tags. Some people get more:
Weight and loose skin. The AAD: “Because they develop where skin rubs against skin, people who are overweight, pregnant, or have loose skin are more likely to get skin tags.” More folds, more friction.
Pregnancy. The NHS says “hormonal changes are thought to cause skin tag growth.” “Thought to” means likely, not settled. For the other skin changes of pregnancy, melasma first among them, see our guide to pregnancy and postpartum wellbeing in a hot climate.
Family. The AAD counts “a blood relative” with skin tags as a risk factor.
Skin Tags and Insulin Resistance: A Link Worth a Check-Up
The sources choose their words carefully here. The AAD says you have “a higher risk of developing skin tags if you have diabetes, metabolic syndrome (high blood pressure, unhealthy blood sugar levels, extra fat around your waist, or unhealthy cholesterol levels).” The NHS says people with type 2 diabetes may get more “because severe insulin resistance is thought to cause more skin tags to grow.” Cleveland Clinic’s overview of insulin resistance lists skin tags, with “darkened skin in your armpit or back and sides of your neck, called acanthosis nigricans,” among symptoms some people with prediabetes notice, and advises seeing your healthcare provider if you have them.
So skin tags are linked to insulin resistance, not proof of it. One tag on a collar line tells you little. Many tags, a crop that appeared quickly, or darker patches on the neck or in the armpits are worth a check-up. Cleveland Clinic says a provider may order blood tests such as a fasting plasma glucose test and an A1c test, which shows your average blood sugar over the past three months. A spa cannot tell you this.
Skin Tag, Mole or Wart? How to Tell Them Apart
The table follows the NHS’s and the AAD’s descriptions. It tells you whom to ask and is no substitute for an examination.
| Growth | Looks and feels | Usual places | Who should look at it |
|---|---|---|---|
| Skin tag | Soft; skin-colored or a little darker, sometimes pink; often hangs off the skin; around 2 mm to 5 cm | Neck, underarms, eyelids, under the breasts, groin | Nobody, unless it bothers you; then a dermatologist, or a spa if it is clearly a skin tag |
| Mole | Usually flat and round or oval; usually a different color from the skin around it, from pink to dark brown | Mostly skin exposed to the sun | A doctor, if it changes in any way |
| Wart | Firm, raised and rough; caused by a virus and contagious | Most often hands and feet: palms, knuckles, fingers, knees | A pharmacist or doctor; a doctor for warts on the face or genitals |
| Needs a doctor | Growing, bleeding, painful, more than one color, irregular edges, or appearing suddenly in numbers | Anywhere | A doctor or dermatologist, before anyone removes it |
Warts deserve a second look. The NHS’s page on warts and verrucas says they “are caused by a virus” and “can be spread to other people from contaminated surfaces or through close skin contact.” The AAD warns that wart remover does not work on skin tags and “can damage your skin,” and the NHS says pharmacy wart treatments should not be used on the face. Above all, the AAD says, “you may mistake a wart or even a skin cancer for a skin tag.”
When to See a Doctor Before Anyone Removes It
Each sign below comes from the NHS, the AAD or our own treatment page, and any one of them means a doctor or dermatologist first, not a spa.
- It gets bigger, or changes shape or color. The NHS lists a tag that “gets bigger”; a change in size, shape or color heads our page’s list.
- It bleeds or hurts. The NHS lists a tag that “becomes painful” or “starts bleeding”; the AAD flags pain “especially when the pain comes on suddenly.” Our page specifies a growth that “bleeds or itches without being caught.”
- It has more than one color, or irregular or blurred edges. Both are on our page’s list.
- It “has appeared recently and is growing,” in our page’s words.
- Many appear at once. The AAD: “Suddenly developing many skin tags while rare can be a sign that something is going on inside your body.” A dermatologist can confirm they are tags and may send you to your primary care doctor.
- It is on the eyelid and affects your sight. The AAD names this as a reason for removal by a dermatologist.
- You are not sure it is a skin tag. Flat, rough or differently colored growths may belong in another row of the table.
As our page puts it, these features “do not mean something is wrong,” but they are for a doctor to examine.
Removing Skin Tags: Leave Them, See a Dermatologist or Use a Spa
Leaving them is a real option. The NHS says skin tags “do not need to be removed.” The AAD says removal is only needed for a tag that is irritated, bleeding, painful or affecting your sight, though disliking how one looks is reason enough to have a dermatologist take it off.
A doctor or dermatologist comes first for anything on the list above and for tags near the eye. The NHS names heat, freezing, or cutting with a surgical blade or scissors as the methods.
Not at home. Thread, nail scissors and online creams all count as removing it yourself. The NHS: “Do not try to remove a skin tag yourself unless a GP recommends it. Risks include infection, bleeding and scarring.” The AAD says the US Food and Drug Administration (FDA) has approved no at-home removal product and “warns people NOT to use them.” And a growth removed at home is one nobody examined.
Any removal can leave a mark. The NHS says scarring or darker skin can follow, “particularly on black or brown skin,” usually temporarily but sometimes for good. Our guide to dark spots on the face and what fades them covers why daily sunscreen matters for marks like these.
Where a Spa Fits for Clearly Benign Skin Tags
The doctor list comes first. For a growth that matches the skin tag row and has not changed, Skin Tag Removal at Chạm Spa costs 50,000 ₫ per tag, with the appointment length set by how many you have treated. It sits on our menu of facial treatments in District 1, though our guide to choosing which facial to book notes that it “is not a facial”: it is charged per spot, not by the hour.
The page is as clear about its limits: “We remove skin tags that are clearly benign. We do not diagnose skin lesions.” If the specialist “is not confident a growth is a straightforward skin tag,” the spa declines and refers you on, and tags very close to the eye may go to a doctor. A spa removes what is known to be harmless; it does not decide whether it is. The session, aftercare and booking are on the treatment page.
What Causes Skin Tags, in Short
Friction on skin folds over years, with weight, pregnancy, family and insulin resistance tipping the odds. Tags are harmless and need removing only if they bother you. Change, bleeding, pain, mixed colors, ragged edges or a sudden crop mean a doctor first; many tags with darker neck patches mean asking about a blood sugar test. Never cut, tie or burn one off at home.
We are at 82/20A Mạc Đĩnh Chi in Tân Định Ward, District 1. Open every day, 09:00–21:00. Book online through Fresha, or on Zalo or WhatsApp at 0986 837 471.
Frequently Asked Questions About Skin Tags
What Causes Skin Tags on the Neck?
Repeated rubbing. The AAD names neck creases and anywhere clothing or jewelry rubs the neck, and the NHS says tags often grow where skin rubs together or folds. Collars, necklaces and creases all work the same strip of skin.
Are Skin Tags a Sign of Diabetes or Insulin Resistance?
They are linked to it, not proof of it. The AAD says diabetes and metabolic syndrome raise the risk, the NHS says severe insulin resistance is thought to cause more tags in type 2 diabetes, and Cleveland Clinic lists skin tags among possible signs of prediabetes. If you have many, ask your doctor about a blood sugar test.
Are Skin Tags Contagious Like Warts?
Neither the NHS nor the AAD lists an infection among the causes of skin tags; both point to friction, weight, pregnancy, diabetes and family. Warts are the contagious lookalike: the NHS says they are caused by a virus and spread through close skin contact or contaminated surfaces.
Why Do Skin Tags Appear During Pregnancy?
The NHS says hormonal changes are thought to cause skin tag growth in pregnancy, and the AAD lists pregnancy among the reasons skin rubs against skin and tags form. Mention any new growth you are unsure about at your next antenatal appointment rather than removing it yourself.
Can You Prevent Skin Tags From Forming?
Not reliably: the NHS says they cannot be prevented. You can reduce irritation of the ones you have, since the AAD says rubbing jewelry, clothing or a seat belt, or a shaving nick, can irritate them. A looser collar or shaving around a tag may help.
Why Is Cutting Off a Skin Tag at Home a Bad Idea?
The NHS warns of infection, bleeding and scarring, and says not to do it unless a GP recommends it. The AAD says no at-home removal product has FDA approval, and that a wart or even a skin cancer can be mistaken for a skin tag.
Can a Skin Tag Turn Out to Be Skin Cancer?
The AAD describes skin tags as harmless. The risk runs the other way: the AAD says a skin cancer can be mistaken for a skin tag. A growth that changes, bleeds, has mixed colors or ragged edges, or keeps growing needs a doctor’s examination.
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