Skin tags tend to appear when something in your body or your environment has shifted, and the most common triggers are weight gain, insulin resistance, hormonal changes, and increased skin-on-skin friction. They rarely show up for a single neat reason. If you have noticed a sudden crop of these small, soft, flesh-colored growths on your neck, armpits, or under your breasts, the explanation usually involves some combination of metabolic changes and mechanical irritation, though the mix varies from person to person.
Friction and Where Skin Tags Like to Grow
Skin tags, known in medical literature as acrochordons, overwhelmingly favor areas where skin rubs against skin or clothing. The neck, armpits, groin folds, under the breasts, and eyelids are the classic locations. This pattern is one of the strongest clues about what causes them: repetitive low-grade friction damages the surface layer of skin, and in susceptible people, the repair process overshoots, producing a tiny stalk of loose connective tissue covered in normal-looking skin.
This is why weight gain is one of the most straightforward explanations for a sudden outbreak. Even a moderate increase in body weight creates new or deeper skin folds, which means more surfaces rubbing together throughout the day. If you have recently gained weight, started a new exercise routine that involves a lot of repetitive motion in tight clothing, or moved to a hotter climate where you sweat more, those are all plausible friction-related triggers. Excessive perspiration itself has been proposed as a contributing factor, since moisture increases the coefficient of friction between skin surfaces and may alter the local skin environment in ways that promote the overgrowth of connective tissue.
The Insulin Resistance Connection
If you are getting skin tags and cannot point to an obvious friction-related change, the next place to look is your metabolism. Skin tags have been linked to insulin resistance for decades, and the research here is fairly consistent. A case-control study from eastern India found that the risk of having metabolic syndrome was roughly eleven times higher in people with skin tags than in matched controls, with waist circumference and low HDL cholesterol being the two components most strongly tied to skin tag occurrence.1PubMed Central. Association of Skin Tag with Metabolic Syndrome and its Components: A Case–control Study from Eastern India A separate Brazilian study found a direct association between skin tags and a standard measure of insulin resistance, independent of whether or not the person had diabetes.2PubMed. Association between skin tags and insulin resistance
The proposed mechanism involves insulin-like growth factor 1 (IGF-1). When your body is producing extra insulin to compensate for insulin resistance, IGF-1 levels tend to rise in parallel. IGF-1 promotes the growth of both the surface skin cells and the underlying connective tissue cells, essentially pushing skin to grow where it otherwise would not.3PubMed Central. Role of insulin-like growth factor-1 in skin tags: a clinical, genetic and immunohistochemical study in a sample of Egyptian patients This is not just a theory; researchers have found elevated IGF-1 receptor expression in skin tag tissue itself, which suggests the growth factor is acting directly on the tissue that becomes a skin tag.
What makes this clinically relevant is timing. Insulin resistance tends to develop gradually, often without obvious symptoms, and a sudden appearance of skin tags may be one of the first outward signs. Some dermatologists treat a new crop of skin tags as a reason to screen for blood sugar abnormalities, especially in people with other risk factors like abdominal weight gain or a family history of type 2 diabetes.
The Lipid Profile Debate
You will sometimes see skin tags described as a “marker for heart disease” or “a warning sign of high cholesterol.” The reality is more complicated. Some studies have found that people with skin tags tend to have higher triglycerides and lower HDL cholesterol, a pattern sometimes called the atherogenic lipid profile.4PubMed. Skin tags and the atherogenic lipid profile One study comparing people with skin tags who also had heart disease against those without heart disease found that both groups had higher triglyceride and cholesterol levels than controls.5PubMed Central. The Evaluation of the Impact of Age, Skin Tags, Metabolic Syndrome, Body Mass Index, and Smoking on Homocysteine, Endothelin-1, High-sensitive C-reactive Protein, and on the Heart
But not all research agrees. A study of patients in Tehran found no significant differences in lipid profiles between people with skin tags and healthy controls, leading the authors to conclude that skin tags may not be a reliable cutaneous marker for dyslipidemia or cardiovascular disease in all populations.6PubMed Central. A comparison study of lipid profile levels between skin tags affected people and normal population in Tehran, Iran The discrepancy probably reflects the fact that insulin resistance and abnormal lipid levels often travel together but are not the same thing. The insulin resistance connection is stronger and more consistent than the lipid connection on its own. If your doctor wants to run blood work after noticing skin tags, they are most likely looking at fasting glucose and insulin levels, not just cholesterol.
Pregnancy and Other Hormonal Shifts
Pregnancy is one of the most common triggers for a sudden wave of skin tags, and many women notice them for the first time during their second or third trimester. The mechanism likely involves both the hormonal surge (estrogen, progesterone, and growth hormone all spike during pregnancy) and the physical changes (weight gain, increased skin friction in folds that did not exist before). A comprehensive review of skin changes during pregnancy lists skin tags alongside hyperpigmentation and stretch marks as physiological cutaneous changes driven by hormonal, mechanical, and immunological factors.7PubMed Central. Cutaneous Changes During Pregnancy: A Comprehensive Review
Some pregnancy-related skin tags shrink or fall off on their own after delivery, though not all do. Other hormonal transitions, including menopause and the use of hormone-containing medications, have been anecdotally linked to skin tag development as well, although the evidence for these associations is thinner than it is for pregnancy.
Genetic Predisposition
Some people are simply more prone to skin tags than others, regardless of their weight or metabolic status. Family clustering of skin tags is well documented, and recent research has started to pin down specific genetic pathways involved. One study identified germline mutations in the thyroid hormone receptor alpha gene in patients who developed multiple skin tags and pigmented moles, predominantly in the head, neck, and flexural areas.8PubMed Central. Germ Line Mutations in the Thyroid Hormone Receptor Alpha Gene Predispose to Cutaneous Tags and Melanocytic Nevi This does not mean that everyone with skin tags carries such a mutation, but it illustrates that the threshold for developing skin tags is partly set by your genetics.
If your parents or siblings have skin tags, you are more likely to develop them yourself, especially once other triggers like aging or weight gain come into play. For genetically susceptible people, even small changes in body composition or hormonal status can tip the balance.
Do Viruses Play a Role?
The question of whether human papillomavirus (HPV) contributes to skin tag formation has been debated for years, and the evidence is genuinely mixed. One study using PCR testing detected low-risk HPV types 6 and 11 in about half of the skin tag specimens examined, while the normal skin around the tags tested negative for HPV.9PubMed. Human papillomavirus and skin tags: Is there any association? That would suggest HPV might be a contributing factor in at least some cases. But another study using similar techniques found no low-risk HPV in any of the skin tag samples tested.10PubMed Central. An Association of Human Papillomaviruses Low Risk and High Risk Subtypes with Skin Tag
The current consensus leans toward HPV being, at most, an occasional co-factor rather than a primary cause. The vast majority of skin tags develop without any viral involvement. This is an area where the science has gone back and forth without settling, and you should not worry that your skin tags indicate a viral infection.
Endocrine Conditions Beyond Diabetes
Insulin resistance and pregnancy are the hormonal stories most people hear about, but skin tags also show up in connection with rarer endocrine conditions. Acromegaly, a disorder caused by excess growth hormone (usually from a pituitary tumor), frequently causes skin changes including skin tags, thickened skin, and darkened velvety patches. Pigmented skin tags and acanthosis nigricans are recognized features of the condition, and recognizing these skin signs can contribute to earlier diagnosis of an otherwise easily missed disorder.11PubMed. Skin manifestations in acromegaly In a clinical study of 34 patients with acromegaly, skin tags were noted on the neck, armpits, and trunk, though the prevalence varied across studies from about 6% to 45%.12PubMed. Skin manifestations of acromegaly – a study of 34 cases
The mechanism in acromegaly is straightforward: excess growth hormone drives excess IGF-1, which is the same growth factor implicated in the insulin resistance pathway. It is not a coincidence that both conditions produce skin tags. If you are developing skin tags alongside other unusual symptoms like enlargement of your hands, feet, or facial features, or persistent headaches and joint pain, it is worth bringing up with your doctor.
When a “Skin Tag” Is Not a Skin Tag
Not every small, fleshy bump on your body is actually a skin tag. Seborrheic keratoses, warts, moles, and small cysts can all mimic skin tags visually. A hospital study comparing clinical diagnoses against tissue analysis found that the clinical diagnosis of a skin tag was confirmed by histology in about 81% of cases, meaning roughly one in five presumed skin tags turned out to be something else.13Journal 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 The misidentified lesions were almost always other benign growths, so the stakes of getting it wrong are usually low.
The rare but more concerning scenario involves skin cancers that look like harmless tags. A case report documented papules clinically resembling skin tags that turned out to be basal cell carcinomas on biopsy, in the context of a genetic syndrome called nevoid basal cell carcinoma syndrome.14Journal of the American Academy of Dermatology. Acrochordons as a presenting sign of nevoid basal cell carcinoma syndrome This is extremely unusual, and it is worth emphasizing that no malignant tumors were mistakenly diagnosed as skin tags in the larger hospital study mentioned above. Still, any growth that changes color, bleeds spontaneously, grows rapidly, or feels firm rather than soft is worth having examined by a dermatologist.
Rare Genetic Syndromes That Involve Skin Tags
If you develop an unusually large number of skin tags, especially in combination with other skin lesions, it is worth knowing that a handful of rare genetic conditions feature skin tags as part of their clinical picture. Birt-Hogg-Dubé syndrome is one example. It involves mutations in the folliculin gene and can produce multiple skin-colored bumps including skin tags, fibrofolliculomas, and trichodiscomas, along with an increased risk of kidney tumors and lung cysts.15PubMed. Birt-Hogg-Dubé Syndrome: A Review of Dermatological Manifestations and Other Symptoms The syndrome was originally described in siblings who had multiple perifollicular fibromas, multiple skin tags, and colon polyps with a tendency toward malignancy.16PubMed. Hornstein-Birt-Hogg-Dubé syndrome: a renaming and reconsideration
These syndromes are uncommon enough that a person with ordinary skin tags should not lose sleep over them. But if you have dozens of skin tags appearing alongside unusual bumps or lumps, especially if family members have similar skin findings or a history of kidney problems, bringing this up with a dermatologist is reasonable.
What Happens Inside a Skin Tag
Under a microscope, skin tags are not terribly exciting. They consist of a core of loose connective tissue (collagen fibers, sometimes with a few fat cells) covered by a normal or slightly thickened layer of skin. One finding that helps explain why they form as soft, floppy stalks rather than firm lumps: the elastic fibers in skin tag tissue are consistently thinner and fewer in number compared to normal surrounding skin.17International Journal of Pathology and Clinical Research. Reduced and Thinned Elastic Fibers in Skin Tag Elastic fibers are what give skin its snap-back quality. Without them, the tissue sags outward into that characteristic pendulous shape.
Skin tags have their own blood supply, which is why they sometimes bleed if caught on jewelry or clothing, and why twisting or tying them off at the base can cause them to shrivel and fall off as the blood flow is cut.
How Skin Tags Are Removed
Most skin tags do not need to be removed for medical reasons, but plenty of people want them gone for comfort or cosmetic purposes. The standard in-office options include snip excision (the doctor simply cuts the tag off at its base with sterile scissors), electrosurgery (a small electrical current burns off the tag), and cryotherapy (freezing the tag with liquid nitrogen). A randomized trial comparing cryotherapy to electrosurgery for skin tags found that patients and physicians were significantly more satisfied with the results of electrosurgery.18PubMed Central. Evaluation and Comparison of the Efficacy and Safety of Cryotherapy and Electrosurgery in the Treatment of Sebaceous Hyperplasia, Seborrheic Keratosis, Cherry Angioma, and Skin Tag: A Blinded Randomized Clinical Trial
Over-the-counter cryogenic devices marketed for home use also exist. In a clinical trial, one such device cleared about 64% of treated skin tags completely, with half of those clearing after a single application.19PubMed Central. Efficacy Evaluation of the Pixie® Skin Tag Cryogenic Device on Skin Tags in a Prospective, Single-Blinded, Randomized, Comparative Clinical Trial That is a reasonable success rate for a home product, though still well below what a doctor can achieve in a quick office visit.
What you should avoid are unregulated “mole and skin tag removers” sold online, many of which contain caustic or acidic compounds with no standardized concentration. An analysis of adverse events reported to the FDA found that these products caused burns, ulceration, and in some cases permanent scarring and disfigurement, including fourteen facial injuries, four of which were near the eye.20PubMed Central. Serious Skin Injuries Following Exposure to Unapproved Mole and Skin Tag Removers Removing a skin tag is one of the simplest procedures in dermatology. The risk-benefit math of using an unapproved caustic product at home, especially on your face, does not add up.
Can You Prevent New Skin Tags From Forming?
Since skin tags arise from a mix of friction, metabolic conditions, hormones, and genetics, there is no guaranteed prevention strategy. But addressing the modifiable factors can reduce your chances. Maintaining a healthy weight directly reduces the number and depth of skin folds where friction occurs. If you already have insulin resistance or metabolic syndrome, managing those conditions through diet, exercise, and medication when appropriate may slow the development of new tags, since the strongest modifiable predictors of skin tags in at least one study were waist circumference and HDL levels.1PubMed Central. Association of Skin Tag with Metabolic Syndrome and its Components: A Case–control Study from Eastern India
Wearing smooth, well-fitting clothing that minimizes rubbing in vulnerable areas can help, as can keeping skin folds dry. Moisture-wicking fabrics and anti-chafing powders reduce both friction and sweat accumulation. None of these steps will guarantee that skin tags stop appearing, but they target the factors most consistently linked to their formation.
How Much Do Skin Tags Affect Daily Life?
For most people, skin tags are a cosmetic annoyance rather than a source of real suffering. A quality-of-life study using a validated skin-disease questionnaire found that 76% of skin tag patients reported good quality of life, with no participants scoring in the severely impaired range.21The Sumatera Medical Journal. QUALITY OF LIFE ASSESSMENT IN SKIN TAG PATIENTS That said, location matters enormously. A skin tag tucked into your armpit that you never see is a different experience than one on your eyelid or the center of your neck. Tags that catch on jewelry, bra straps, or seatbelts can be persistently irritating, and visible ones bother some people more than the formal quality-of-life scores might suggest. If a skin tag is bothering you physically or emotionally, removal is fast, low-risk, and usually quite affordable.