Skin tags cluster on the neck more than almost anywhere else on the body because the neck combines two of the strongest triggers for their growth: constant skin-on-skin friction and a rich supply of the growth signals that drive these tiny benign growths. In one study of skin tag patients, the neck accounted for the vast majority of cases, far outpacing even the armpits, the next most common site.1Journal of Microscopy and Ultrastructure. Immunohistochemical study of estrogen and androgen receptors in skin tags But friction alone does not explain why some people develop dozens of them while others get none. The real story involves metabolism, hormones, body weight, and genetics working together beneath the surface.
What Skin Tags Actually Are
A skin tag is a small, soft pouch of tissue that hangs off the skin by a thin stalk. Medically called an acrochordon, it is one of the most common benign skin growths in adults. Under a microscope, skin tags are made up of loose collagen fibers and dilated blood vessels, all wrapped in a normal-looking outer layer of skin.2PubMed. Immunohistochemical Evaluation of Leptin Role in Skin Tags They are not cancerous, and they do not become cancerous. Some are barely visible, while others grow to the size of a grape or, in rare cases, much larger. They tend to be flesh-colored or slightly darker, and they are usually painless unless something catches on them.
The neck, armpits, groin folds, eyelids, and area under the breasts are the classic locations. What all these spots share is that the skin regularly rubs against itself or against clothing. That mechanical irritation is widely considered one of the initiating factors, though the story gets more interesting when you look at what else is going on in people who develop large numbers of them.
Friction and Why the Neck Is Ground Zero
Friction is a well-recognized trigger for a range of skin conditions, from thickened calluses to pigment changes. A comprehensive review of friction-related skin disorders found that repeated rubbing can alter both the outer skin layer and the deeper dermal tissue, and it has been linked to the formation of various skin growths.3PubMed Central. Friction-Induced Skin Disorders-A Review The neck is particularly vulnerable because it moves constantly, necklaces and collars sit against it all day, and in people who carry extra weight, deeper skin folds form along the sides and back of the neck. That combination of movement plus contact pressure creates an ideal environment for skin tags to start.
You can see this friction effect in the data on where skin tags appear. A study examining the distribution in patients found the neck involved in 96% of cases, while the axilla (armpit) showed up in 44%.1Journal of Microscopy and Ultrastructure. Immunohistochemical study of estrogen and androgen receptors in skin tags Both areas are friction zones, but the neck wins out, likely because it is almost never at rest and is exposed to shirt collars, jewelry, and the natural creasing of the skin throughout the day.
The Insulin Connection
If you have a lot of skin tags, the single most important thing to understand is their link to insulin resistance. Multiple skin tags, especially when they appear in large numbers, are strongly associated with the body’s inability to use insulin efficiently. When insulin levels stay chronically high, the excess insulin stimulates receptors on fibroblasts, the cells that produce the collagen making up a skin tag. Specifically, insulin activates receptors for insulin-like growth factor (IGF-1), essentially telling the skin cells to keep growing when they normally would not.4Anais Brasileiros de Dermatologia. Association of acanthosis nigricans and skin tags with insulin resistance
A case-control study from eastern India put concrete numbers to this relationship: people with skin tags had roughly eleven times the risk of meeting the criteria for metabolic syndrome compared to controls. Rates of diabetes and high blood pressure were also significantly higher in the skin tag group.5PubMed Central. Association of Skin Tag with Metabolic Syndrome and its Components: A Case–control Study from Eastern India That does not mean every person with skin tags has diabetes or will develop it. But when skin tags start multiplying, particularly in your thirties or forties, they can serve as a visible clue that your blood sugar and insulin levels deserve a closer look.
It is worth noting that the metabolic picture is not perfectly uniform across all studies. One analysis found that while obesity and abnormal lipid levels were clearly tied to multiple skin tags, the direct association with a diabetes diagnosis did not reach significance in that particular sample.6Journal of Clinical and Aesthetic Dermatology. The Association of Various Metabolic Parameters with Multiple Skin Tags The weight of evidence still points firmly toward insulin resistance as a driver, but not every person with a cluster of skin tags has overtly abnormal blood sugar.
Body Weight and How It Multiplies the Problem
Obesity does not just increase friction in skin folds. It amplifies the metabolic signals that cause skin tags to form. Studies consistently show that people with skin tags have higher average body mass index than those without. One study found a mean BMI of about 28 in the skin tag group compared to about 24 in controls, and people with multiple lesions had higher BMI than those with only one.7PubMed Central. The Correlation between Body Mass Index with the Occurrence of Skin Tag The same study found that skin tags appearing in flexure areas, the folds where skin rubs together, were associated with higher body weight than those appearing elsewhere.
Another study found that the sheer number of skin tags increased significantly with both BMI and age, and that obese participants were more likely to develop mixed-color skin tags, a feature associated with higher body weight.8PubMed Central. A CLINICAL EVALUATION OF SKIN TAGS IN RELATION TO OBESITY, TYPE 2 DIABETIS MELLITUS, AGE, AND SEX The practical takeaway here is that the neck is a double hit for heavier individuals: more friction from deeper skin folds, plus higher circulating insulin and growth factors pushing the skin to form new tags.
Cholesterol, Triglycerides, and Leptin
The metabolic connection extends beyond blood sugar. Abnormal lipid levels, particularly elevated triglycerides and LDL cholesterol, have been independently associated with having multiple skin tags.9PubMed Central. Assessment of Various Biochemical Parameters and BMI in Patients with Skin Tags Cholesterol and triglyceride levels were also significantly linked to skin tags in a separate analysis.10PubMed Central. The Association of Various Metabolic Parameters with Multiple Skin Tags
Leptin, a hormone produced by fat cells that regulates appetite and energy balance, appears to be part of the picture too. People with skin tags had significantly higher leptin levels than controls in one study, and those elevated leptin levels tracked with high triglycerides and low HDL cholesterol.11PubMed. Skin tags, leptin, metabolic syndrome and change of the life style In obese skin tag patients specifically, leptin levels were significantly higher than in obese people without skin tags, and both the number of skin tags and leptin levels were higher in patients who met the criteria for metabolic syndrome.12PubMed. Assessment of serum leptin, insulin resistance and metabolic syndrome in patients with skin tags Leptin resistance, a state where your body produces large amounts of the hormone but stops responding to it properly, tends to travel with insulin resistance. The two reinforce each other, and both appear to create a biochemical environment that favors skin tag growth.
Hormones and Pregnancy
Many people notice new skin tags appearing during pregnancy, and this is not coincidental. Skin tags are described as hormone-responsive growths commonly found on the skin of women of reproductive age.13PubMed. Giant vulvar acrochordon (skin tag) presenting in second trimester of pregnancy Pregnancy involves a dramatic rise in estrogen, progesterone, and growth hormones, all of which can stimulate the same fibroblast activity that insulin drives. Researchers have found both estrogen and androgen receptors in skin tag tissue, suggesting that sex hormones play a direct role in their formation.1Journal of Microscopy and Ultrastructure. Immunohistochemical study of estrogen and androgen receptors in skin tags
If you developed a crop of neck skin tags during pregnancy or around menopause, fluctuating hormone levels were likely a contributor. Some skin tags that appear during pregnancy shrink or fall off after delivery as hormone levels normalize, though many remain.
Do Genetics Play a Role?
Some families seem prone to skin tags regardless of body weight or metabolic health, and there is emerging evidence that specific genetic variants influence susceptibility. An Egyptian study found that certain genotypes of the IGF-1 gene were significantly more common in skin tag patients than in controls, and these same genotypes were associated with having multiple skin tags and with higher IGF-1 activity in skin tissue.14PubMed Central. Role of insulin-like growth factor-1 in skin tags: a clinical, genetic and immunohistochemical study in a sample of Egyptian patients This fits the broader metabolic picture: genetic variation in how your body handles growth factor signaling can predispose you to developing skin tags even if your insulin levels are only mildly elevated.
There are also rare inherited conditions in which skin tags appear as part of a larger syndrome. In one report, skin tags were the presenting sign of basal cell nevus syndrome in three sisters from the same family, illustrating that in unusual cases, a cluster of skin tags can point to an underlying genetic condition.15PubMed Central. Skin tags as a presenting sign of basal cell nevus syndrome in three sisters of the same family For most people, though, genetic predisposition likely plays a background role that amplifies the effects of weight, hormones, and metabolic health.
The HPV Question
One persistent question in the dermatology literature is whether human papillomavirus (HPV) contributes to skin tag formation. An early study using PCR analysis detected HPV DNA, specifically low-risk types 6 and 11, in about half of the skin tag samples tested, while the surrounding normal skin was negative.16PubMed. Human papillomavirus and skin tags: Is there any association? That finding raised the possibility that HPV might trigger or promote skin tag growth in some people.
However, a separate study using different methods found no low-risk HPV in skin tag samples and no significant difference between skin tags and controls for either low-risk or high-risk HPV subtypes.17PubMed Central. An Association of Human Papillomaviruses Low Risk and High Risk Subtypes with Skin Tag The discrepancy likely reflects differences in the sensitivity of the detection methods used. The current consensus is that HPV is not a major driver of skin tag formation in most people, though it may be present incidentally in some lesions. If you have dozens of skin tags on your neck, HPV is almost certainly not the explanation.
What Is Happening at the Cellular Level
Beyond the growth factor and hormonal signals, the tissue inside skin tags shows other distinctive features that help explain why they form where they do. Mast cells, a type of immune cell involved in inflammation and tissue remodeling, are present at significantly higher density in skin tags compared to normal skin.18PubMed. Role of mast cells in skin tag development: an immunohistochemical study Mast cells release chemicals that promote blood vessel growth and stimulate connective tissue proliferation, both of which are features of skin tag tissue. This suggests that local inflammatory signals in areas of chronic friction may help initiate or sustain skin tag development, working alongside the systemic metabolic drivers.
When a Skin Tag Might Not Be a Skin Tag
Most skin tags are easy to identify by appearance: a soft, flesh-colored or slightly darker bit of tissue hanging from a narrow stalk. But occasionally, other growths can mimic skin tags, and the reverse is true too. A hospital-based study that compared clinical diagnoses with biopsy results found that about 81% of growths diagnosed as skin tags were confirmed on microscopic examination.19Journal 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 reassuring part of that study: no malignant lesions were misdiagnosed as skin tags. In other words, if a doctor looks at something and confidently calls it a skin tag, the chance that it is actually a cancer is essentially zero.
That said, you should see a dermatologist if a growth changes color rapidly, bleeds without being irritated, feels hard or fixed to the skin rather than hanging freely, or grows much larger than the soft tags around it. These features are uncommon in true skin tags and warrant a closer look.
Getting Rid of Them
Skin tags do not need to be removed for medical reasons, but many people find them cosmetically bothersome or annoying when they catch on jewelry or clothing. The standard clinical options are cryotherapy (freezing), electrosurgery (burning with an electrical current), and simple snip excision with sterile scissors. A randomized trial comparing cryotherapy and electrosurgery for several benign skin growths found that for skin tags specifically, both patients and physicians reported higher satisfaction with electrosurgery than with freezing.20PubMed 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 Study Minor side effects like temporary pigment changes or small scars occurred in a small percentage of patients with both methods.
Over-the-counter cryogenic devices are also available. One clinical trial of a home cryotherapy device found that about 64% of treated skin tags completely disappeared during the study period, with half clearing after a single treatment.21PubMed Central. Efficacy Evaluation of the Pixie(®) Skin Tag Cryogenic Device on Skin Tags in a Prospective, Single-Blinded, Randomized, Comparative Clinical Trial These devices work best on small tags and may not be effective for larger ones.
What you should avoid is unregulated “mole and skin tag removal” products sold online. A review of adverse event reports associated with unapproved topical removers found cases of burns, ulceration, and permanent scarring, including injuries near the eyes.22PubMed Central. Serious Skin Injuries Following Exposure to Unapproved Mole and Skin Tag Removers Some patients required hospital care or were advised to consider skin grafts. Tying off a skin tag at home with thread is a folk remedy that occasionally works for very small tags but risks infection and incomplete removal. For anything bigger than a pinhead, professional removal is safer and faster.
Can You Prevent New Ones From Forming?
Removing existing skin tags does not stop new ones from growing, and recurrence is common if the underlying conditions remain unchanged. The most effective prevention strategy targets the metabolic root: reducing insulin resistance through weight management, regular physical activity, and dietary changes that lower blood sugar and improve lipid profiles. Research on the related condition acanthosis nigricans, which shares the same insulin resistance mechanism, has shown that controlling obesity can reverse the metabolic process that drives these skin changes.23PubMed. Acanthosis nigricans associated with insulin resistance : pathophysiology and management
Reducing friction in the neck area can also help. Soft, smooth-collared clothing, keeping the area dry, and avoiding heavy or rough necklaces will not eliminate the metabolic signaling, but they remove one of the local triggers. If you have been gaining weight and noticed a corresponding increase in neck skin tags, those growths are your skin’s way of signaling something about your metabolic health that is worth discussing with a doctor, even if the skin tags themselves are harmless.
Age, Sex, and Why They Keep Multiplying
Skin tags are rare in children and become increasingly common after age 30, with the number tending to rise with each decade of life. One clinical evaluation found that the count increased significantly with age even after accounting for BMI.8PubMed Central. A CLINICAL EVALUATION OF SKIN TAGS IN RELATION TO OBESITY, TYPE 2 DIABETIS MELLITUS, AGE, AND SEX This age-related increase likely reflects the gradual worsening of insulin sensitivity that happens naturally as you get older, compounded by the cumulative effects of friction, sun exposure, and hormonal shifts. Men and women develop skin tags at roughly similar rates overall, though the hormonal surges of pregnancy give women additional windows of susceptibility.
A small quality-of-life study found that most skin tag patients reported little impact on their daily wellbeing, with the large majority scoring in the lowest category on a standard skin-related quality-of-life scale.24The Sumatera Medical Journal. QUALITY OF LIFE ASSESSMENT IN SKIN TAG PATIENTS That does not mean they are not annoying. But if you are anxious about a neck full of skin tags, the medical evidence is clear that they are benign, they are extremely common, and their most valuable function may be as an early-warning system for metabolic conditions you can actually do something about.