Skin tags form when several overlapping factors converge on the same stretch of skin: repeated friction, hormonal shifts, metabolic changes related to insulin and body weight, and simply getting older. Most people develop at least a few over their lifetime, but when they seem to multiply, the explanation usually traces back to one or more of these drivers working together. The connection between skin tags and underlying metabolic health is stronger than most people realize, and understanding it can turn a cosmetic nuisance into a useful early-warning signal.
What a Skin Tag Actually Is
A skin tag, known medically as an acrochordon or fibroepithelial polyp, is a small, soft, flesh-colored or slightly darker growth that hangs from the skin by a thin stalk. They are entirely benign. Under a microscope, they consist of a core of loose connective tissue, some fat cells, and a covering of normal-looking skin. They range from a pinhead to roughly a centimeter across, though rare giant versions have been documented at ten centimeters or more.1PubMed. Giant vulvar acrochordon (skin tag) presenting in second trimester of pregnancy They tend to cluster in areas where skin folds rub against skin or clothing: the neck, armpits, under the breasts, the groin, and eyelids.
Friction Is the Most Obvious Trigger
The spots where skin tags show up most often are the spots where skin rubs the most. That is not a coincidence. Dermatologists have long observed that skin-on-skin friction or friction from clothing and jewelry promotes their growth. One documented case described a patient who developed skin tags arranged in a clear linear pattern along a friction line, strongly suggesting that repeated mechanical irritation was the direct trigger.2PubMed. Friction induced skin tags This is why skin tags are overwhelmingly found in what clinicians call intertriginous areas, the creases and folds where two skin surfaces press and slide against each other.
Friction alone does not fully explain why some people develop dozens while others get none, though. Plenty of people have skin folds without developing a single tag. The mechanical irritation seems to work more like a trigger that needs a metabolic or hormonal backdrop to really take off.
The Insulin Resistance Connection
If you have a lot of skin tags, the single most important thing to consider is your metabolic health. A growing body of research links skin tags to insulin resistance, a condition where your cells respond less efficiently to insulin and your body compensates by producing more of it. That excess circulating insulin is thought to stimulate skin cell growth through its interaction with growth-factor receptors in the skin.
Skin tags are now recognized as one of the visible cutaneous markers of insulin resistance, alongside darkened, velvety patches of skin known as acanthosis nigricans.3PubMed Central. Skin Manifestations of Insulin Resistance: From a Biochemical Stance to a Clinical Diagnosis and Management This matters because insulin resistance can be quietly present for years before blood sugar levels climb high enough to trigger a diabetes diagnosis. Multiple skin tags showing up, especially in someone who also carries extra weight around the midsection, can be a visible, real-time hint that something metabolic is shifting beneath the surface.
A case-control study from eastern India found that people with skin tags were roughly eleven times more likely to meet the criteria for metabolic syndrome than matched controls. When the researchers drilled into which specific components of metabolic syndrome predicted skin tags most strongly, two stood out: increased waist circumference and low HDL cholesterol.4PubMed Central. Association of Skin Tag with Metabolic Syndrome and its Components: A Case–control Study from Eastern India The waist circumference finding makes intuitive sense on two levels: it reflects the visceral fat that drives insulin resistance, and it also creates more skin folds where friction occurs.
Body Weight and the Number of Tags
The link between higher body mass index and skin tags is one of the most consistently replicated findings in the dermatology literature. In one study comparing people with skin tags to a control group, the average BMI in the skin tag group was about 28 compared to 24 in controls. Roughly three out of four skin tag patients were overweight or obese, while only one in four had a normal weight.5PubMed Central. The Correlation between Body Mass Index with the Occurrence of Skin Tag
That same study also found a pattern that many dermatologists recognize anecdotally: people with higher BMIs tended to have more tags, and those tags were more likely to be in flexure areas like the armpits and groin. People with tags in non-fold areas (like the trunk) tended to be leaner. So it is not just that carrying extra weight makes skin tags more likely; it shapes where they appear and how many you get.
This association also shows up in children and teenagers, not just adults. A retrospective cohort study of the pediatric population found that skin tags can serve as a marker for metabolic disease in young people too, suggesting the link between tags and metabolic health starts early in life.6PubMed. The relationship between acrochordons, obesity, and metabolic syndrome in the pediatric population: A retrospective cohort study
Skin Tags as a Clue to Diabetes Risk
Because skin tags and insulin resistance travel together, researchers have explored whether skin tags could work as a simple screening flag for diabetes. The relationship is real but not perfectly clean. One study found that patients with skin tags were about three times as likely to have diabetes compared to controls (roughly 23% versus 9%), and that people who had more than 30 skin tags were at particularly elevated risk, with over half of that subgroup having diabetes.7PubMed. Skin tag as a cutaneous marker for impaired carbohydrate metabolism: a case-control study The total number of tags also correlated positively with fasting blood glucose.
Other studies, however, have found less dramatic differences. One clinical evaluation comparing diabetic and non-diabetic patients found that skin tag prevalence was slightly higher in the diabetic group (about 61% versus 58%), but the gap was not statistically significant.8PubMed Central. A CLINICAL EVALUATION OF SKIN TAGS IN RELATION TO OBESITY, TYPE 2 DIABETIS MELLITUS, AGE, AND SEX The evidence leans toward skin tags being useful as a soft prompt to check metabolic health, especially when they are numerous, but they are not a reliable diagnostic test on their own. A screening study found that skin tags had modest sensitivity (around 32-38%) but high specificity (around 85-89%), meaning that if you have skin tags it does not guarantee a metabolic problem, but having them does raise the odds enough to be worth investigating.9PubMed Central. Utility of “Acanthosis Nigricans” and “Skin Tags” as a screening tool for risk of developing noncommunicable diseases: A cross-sectional study at a health facility in Lucknow (India)
The practical takeaway: if you are developing a lot of skin tags, particularly around your neck, armpits, and waist, and you have not had bloodwork done recently, it is reasonable to ask your doctor to check your fasting glucose, insulin levels, or HbA1c.
Leptin and Fat-Tissue Signaling
Beyond insulin, another hormone tied to fat tissue appears to play a role. Leptin, a hormone produced by fat cells that helps regulate appetite, has been found at elevated levels in people with skin tags. One study found a strong positive correlation between serum leptin levels and the number of skin tag lesions, with a correlation coefficient of 0.86, which is remarkably high for a biological association. People with mixed-type lesions (a combination of the small filiform tags and the broader sessile ones) had the highest leptin levels.10PubMed Central. Correlation between Serum Leptin Level with Type and Number of Lesion Skin Tag
Leptin is known to stimulate cell growth in multiple tissues, and elevated leptin is itself a feature of obesity and insulin resistance. This finding fits into a broader picture: excess fat tissue is not just passive storage. It actively pumps out hormones and signaling molecules that push skin cells to grow, and skin tags may be one of the most visible downstream consequences.
What Happens Inside the Skin
At the tissue level, researchers have found that skin tag tissue contains significantly more mast cells than normal surrounding skin. Mast cells are immune cells best known for triggering allergic reactions, but they also release enzymes and signaling molecules that drive tissue remodeling. In skin tags, mast cells appear to release an enzyme called tryptase at higher-than-normal levels, and the more tryptase present, the more collagen buildup (fibrosis) researchers find in the tag.11PubMed. Role of mast cells in skin tag development: an immunohistochemical study
The current thinking is that friction or other local irritation recruits mast cells to the area. Those mast cells then release mediators, including tryptase and tumor necrosis factor alpha (TNF-α), that stimulate nearby fibroblasts to proliferate and lay down excess collagen.12PubMed Central. The Possible Role of Trauma in Skin Tags through the Release of Mast Cell Mediators A study comparing mast cell tryptase expression in skin tags versus non-lesional skin confirmed significantly higher mast cell numbers in the tags, and linked that elevated tryptase to fibroblast stimulation.13PubMed Central. Skin Tags: A Link Between Lesional Mast Cell Count/Tryptase Expression and Obesity and Dyslipidemia This mechanism helps explain why friction matters: physical irritation is a known activator of mast cells. It also connects back to obesity, since people with excess weight carry higher baseline levels of systemic inflammation.
Hormones and Pregnancy
Many women notice new skin tags during pregnancy, and this is not imagined. Skin tags are described as hormone-responsive lesions commonly found on mucosal and skin surfaces of women of reproductive age.1PubMed. Giant vulvar acrochordon (skin tag) presenting in second trimester of pregnancy The hormonal surges of pregnancy, particularly rising estrogen and growth hormone, appear to promote the same kind of fibroblast growth that leads to tag formation. Pregnancy also involves insulin resistance as a normal physiological adaptation, compounding the effect. Tags that appear during pregnancy sometimes shrink or fall off postpartum as hormone levels normalize, though they can also persist.
Age and the Plateau Effect
Skin tags become more common as people age, and this tracks with the gradual rise in insulin resistance, body weight, and cumulative skin friction that tends to accompany the decades. A study examining skin tag frequency by age and sex found that the risk increases steadily with age but appears to plateau around 50, after which new tags stop appearing as rapidly.14Dermatology. Skin Tags: Localization and Frequencies According to Sex and Age The number and duration of existing skin tags also correlated positively with age, BMI, blood sugar, and cholesterol levels in a hospital-based prevalence study.15Journal of the Egyptian Women’s Dermatologic Society. Prevalence, clinical criteria, and risk factors of skin tags: a hospital-based study
The plateau around age 50 is interesting. One explanation is that the skin itself changes with age, becoming thinner and less elastic, which may reduce the mechanical conditions that promote tag formation. Another is that the people most metabolically susceptible have already developed their tags by that point. Whatever the reason, if you are noticing a flurry of new skin tags in your thirties or forties, it aligns with the period of life when metabolic risk factors tend to be climbing fastest.
The HPV Question
Some researchers have investigated whether human papillomavirus (HPV) plays a role in skin tag formation, and the results are genuinely mixed. One study found low-risk HPV types 6 and 11 in about half of skin tag specimens tested, while none of the surrounding normal skin tested positive for the virus.16PubMed. Human papillomavirus and skin tags: Is there any association? That is a striking result, but other studies have failed to replicate it. One found no HPV in skin tag samples at all, with the only HPV-positive specimens actually coming from the control group.17PubMed Central. An Association of Human Papillomaviruses Low Risk and High Risk Subtypes with Skin Tag
The discrepancy likely reflects differences in testing methods, sample handling, and the populations studied. As it stands, HPV is not considered a primary cause of skin tags in the way it causes warts. It may be an occasional bystander found in some skin tag tissue, or it may play a contributory role in a subset of cases. If you are worried about HPV driving your skin tags, the evidence does not currently support that as the main explanation.
Cholesterol, Triglycerides, and Cardiovascular Signals
Because skin tags overlap so heavily with metabolic syndrome, researchers have looked at whether they correlate with abnormal blood lipids. The picture is nuanced. A case report described four patients with extensive skin tags who all displayed a characteristic atherogenic lipid profile: high triglycerides and low HDL cholesterol, a pattern linked to cardiovascular risk.18PubMed Central. Skin tags and the atherogenic lipid profile A larger study found that people with skin tags had significantly higher total cholesterol and LDL than healthy controls.19PubMed Central. SERUM LEPTIN, ATHEROGENIC LIPIDS AND GLUCOSE LEVELS IN PATIENTS WITH SKIN TAGS
However, another comparison study found no significant differences in triglycerides or cholesterol based on skin tag number alone.20PubMed Central. A comparison study of lipid profile levels between skin tags affected people and normal population in Tehran, Iran The waist-circumference and low-HDL findings from the metabolic syndrome study mentioned earlier are probably the most robust signal: it is the overall metabolic package, not any one lipid number in isolation, that tracks with skin tags. Still, if your skin is sprouting tags and you have not had a lipid panel done, the association is another reason to get one.
Rare Genetic Conditions That Cause Skin Tags
In uncommon cases, a crop of skin tags can be the first visible sign of an inherited syndrome. Birt-Hogg-Dubé syndrome is a genetic condition that causes small benign tumors of the hair follicle along with skin tags, usually appearing on the face, neck, and upper trunk in the second through fourth decades of life. The lesions increase in number and size with age.21PubMed Central. Birt–Hogg–Dubé Syndrome: A Rare Genodermatosis Presenting as Skin Papillomas Birt-Hogg-Dubé also carries a risk of kidney tumors and spontaneous lung collapse, so recognition matters beyond cosmetics.
In children specifically, skin-tag-like growths warrant closer attention. One report described a child in whom what appeared to be ordinary skin tags turned out to be basal cell carcinomas, the presenting sign of nevoid basal cell carcinoma syndrome (Gorlin syndrome).22Journal of the American Academy of Dermatology. Acrochordons as a presenting sign of nevoid basal cell carcinoma syndrome Skin tags are common and unremarkable in adults, but in children they are unusual enough that biopsy should be considered.
When a Skin Tag Is Not a Skin Tag
Most people identify their own skin tags correctly, and the clinical accuracy is generally decent. In a hospital-based study comparing clinical diagnoses with histological confirmation, the clinical diagnosis of skin tag was correct about 81% of the time. No malignant lesions were misdiagnosed as skin tags, which is reassuring: a growth that looks like a straightforward skin tag to a trained eye is extremely unlikely to be hiding something dangerous.23Journal of the European Academy of Dermatology and Venereology. Accuracy of diagnosis of benign skin lesions in hospital practice: a comparison of clinical and histological findings
That said, several other benign and occasionally not-so-benign growths can look similar to skin tags at a glance. Seborrheic keratoses, small warts, neurofibromas, and molluscum contagiosum can all appear as soft, protruding skin bumps. If a growth changes color, bleeds without being snagged, grows rapidly, or appears firm rather than soft, it is worth having a dermatologist take a look. The one consistent finding across studies is that routine biopsy of typical-looking skin tags in adults is unnecessary, since the risk of missed malignancy is essentially zero.
Removal Options and Recurrence
Skin tags do not need to be removed for medical reasons, but plenty of people want them gone for comfort or cosmetic reasons. The standard clinical methods are snip excision (cutting the stalk with scissors), cryotherapy (freezing), and electrodesiccation (burning with a fine electric probe). All three are quick and effective for small tags.
Over-the-counter cryogenic devices have also been tested. One clinical trial comparing two consumer cryogenic products found that the better-performing device cleared about two-thirds of treated skin tags during the study period, with half of those clearing after a single application.24PubMed Central. Efficacy Evaluation of the Pixie(®) Skin Tag Cryogenic Device on Skin Tags in a Prospective, Single-Blinded, Randomized, Comparative Clinical Trial Both products were safe and well tolerated, though the less effective product cleared only about 7% of tags, which underscores that not all at-home devices deliver the same results.
A common frustration is recurrence. Removing skin tags does nothing about the underlying conditions that caused them. If friction, insulin resistance, or excess weight are still present, new tags will continue to appear in the same areas. This is why the metabolic connection matters practically: addressing the root metabolic factors through weight management, improved insulin sensitivity, and controlling blood sugar can slow the appearance of new tags in a way that removal alone never will. Tying a tag off with dental floss, a popular home remedy, can work for small stalked tags by cutting off blood flow, but carries a risk of infection and is better left for tags you can clearly see and reach.