Skin Tags: What Could Be Causing It?

What Exactly Is a Skin Tag?

A skin tag is a small, soft, flesh-colored growth attached to the skin by a narrow stalk called a peduncle. Histologically, it is a fibroepithelial polyp containing a loose fibrovascular core covered by flattened epidermis. Tags are almost always benign and cause no systemic harm on their own.

Basic Anatomy

Under the microscope, an acrochordon shows hyperkeratotic epidermis, dilated capillaries, and collagen fibers in a loosely arranged stroma. A 2008 study published in the Indian Journal of Dermatology found mast cells, nerve fibers, and fat lobules in the cores of larger tags, suggesting they are true hamartomatous lesions rather than simple reactive proliferations [1].

How Common Are They?

Population data are consistent across cohorts. A cross-sectional analysis of 4,379 adults found acrochordons in approximately 46% of subjects, with prevalence rising sharply after age 40 [2]. Skin tags appear equally across sexes, though pregnancy substantially raises short-term incidence in women.

Root Causes of Skin Tags

Skin tags do not have a single cause. Friction is the mechanical trigger, but metabolic and hormonal conditions set the biological stage, making some people far more likely to develop them than others.

Chronic Skin-on-Skin Friction

The most straightforward explanation is repetitive mechanical rubbing. Skin folds in the neck, armpits, groin, and beneath the breasts experience constant low-grade trauma. This friction stimulates epidermal cell proliferation and excess collagen deposition, which accumulates into a pedunculated tag over months to years. Tight clothing, jewellery, and sports equipment can act as friction sources even in skin-fold-free areas [3].

Insulin Resistance and Type 2 Diabetes

This is the metabolic connection that most clinicians watch for. Elevated insulin acts as a growth factor through the insulin-like growth factor-1 (IGF-1) receptor pathway, stimulating fibroblast and keratinocyte proliferation. A case-control study (N=422) published in Dermatology found that patients with multiple acrochordons had significantly higher fasting glucose and HOMA-IR scores compared to age-matched controls (P<0.001) [4]. The same paper noted that acrochordon count correlated positively with HbA1c levels, suggesting tags may function as a visible marker of glycemic dysregulation.

Obesity and Metabolic Syndrome

Excess body weight amplifies both friction and insulin resistance simultaneously. A 2010 analysis in the Journal of the European Academy of Dermatology and Venereology (N=780) found that subjects with a BMI >30 had 2.4 times the odds of developing skin tags compared to normal-weight controls [5]. Adipose tissue itself secretes adipokines, including leptin and resistin, that may drive local fibroblast activity in intertriginous zones.

Hormonal Fluctuations

Estrogen and progesterone both stimulate keratinocyte growth factor expression. Skin tags appear or multiply frequently during the second and third trimesters of pregnancy, and they often regress partially after delivery as hormone levels normalize [6]. Women using hormonal contraceptives or undergoing hormone replacement therapy sometimes report new tag development, though controlled trial data on this mechanism remain limited.

Genetic Predisposition

Family clustering is well documented anecdotally and supported by case series. A study in Acta Dermato-Venereologica identified familial aggregation in 18% of affected patients, with first-degree relatives showing a 2.1-fold increased relative risk [7]. No single gene has been isolated; the pattern is polygenic and likely involves variants affecting fibrous tissue turnover.

Human Papillomavirus (HPV)

Several research groups have detected low-risk HPV DNA inside acrochordon tissue using polymerase chain reaction. A meta-analysis of 9 studies (combined N=374) found HPV DNA in 48% of analyzed skin tags, with types 6 and 11 predominating [8]. This finding is provocative but does not mean skin tags are contagious or sexually transmitted. Researchers debate whether HPV drives tag formation or simply colonizes tag tissue opportunistically after friction disrupts the epithelial barrier.

Who Gets Skin Tags Most Often?

Certain populations carry disproportionately high risk. Recognizing these groups helps clinicians and patients decide how urgently a metabolic workup is needed.

High-Risk Groups

Adults over 40, people with a BMI >30, those with prediabetes or type 2 diabetes, pregnant women in the second trimester, and individuals with a first-degree relative who has had multiple tags all sit in the highest-risk tier. People with acanthosis nigricans (the velvety hyperpigmented plaques seen in insulin resistance) very frequently have concurrent acrochordons, because both conditions share the same IGF-1-driven keratinocyte proliferation pathway [9].

Rare Syndromic Associations

Birt-Hogg-Dube syndrome, Cowden syndrome, and polycystic ovary syndrome (PCOS) each carry acrochordon formation as a recognized feature. When a patient younger than 30 presents with many tags and no obvious metabolic explanation, these syndromic diagnoses deserve consideration. Birt-Hogg-Dube is caused by pathogenic variants in the FLCN gene and also raises renal cell carcinoma risk, which changes the clinical stakes considerably [10].

How Are Skin Tags Diagnosed?

Diagnosis is almost always clinical. A board-certified dermatologist or primary care physician can identify an acrochordon by its characteristic soft, pedunculated, flesh-colored appearance in a skin-fold location. No imaging or blood test is required for the tag itself.

Clinical Examination

The physician checks stalk width, surface texture, color uniformity, and the presence of any firmness or ulceration. A typical tag is soft, moves freely on its stalk, and matches the surrounding skin color or is slightly darker. Firmness, irregular pigmentation, or a broad base raises concern for a different diagnosis.

Dermoscopy

When the clinical picture is unclear, dermoscopy adds confidence. Under polarized light, an acrochordon shows a homogeneous pale-yellow or pink area without the atypical vascular patterns or pigmented network seen in dysplastic nevi or basal cell carcinoma. A 2019 review in the International Journal of Dermatology found dermoscopy reduced unnecessary excision biopsies by approximately 30% in ambiguous pedunculated lesions [11].

When to Biopsy

Histopathologic confirmation is indicated if the lesion bleeds spontaneously, grows faster than expected, shows mottled pigmentation, or sits on a wide sessile base rather than a narrow stalk. The differential for a rapidly changing pigmented pedunculated lesion includes seborrheic keratosis, pedunculated melanocytic nevus, neurofibroma, and rarely a verrucous carcinoma [12]. Biopsy removes uncertainty.

Associated Metabolic Workup

When a patient presents with five or more new tags, current clinical practice at many centers includes fasting glucose, HbA1c, and fasting lipid panel to screen for metabolic syndrome. The American Diabetes Association recommends HbA1c screening for all adults 35 to 70 with overweight or obesity, a category that overlaps heavily with the skin-tag-prone population [13].

Conditions That Mimic Skin Tags

Several benign and occasionally serious conditions can look like skin tags. Correct identification matters before any removal procedure.

Common Mimics

Seborrheic keratoses are waxy, stuck-on plaques that can become pedunculated but usually show a verrucous, rough surface. Dermatofibromas are firm, slightly depressed nodules that dimple inward when pinched (the Fitzpatrick sign). Warts caused by high-risk HPV strains present as rough, hyperkeratotic papules, often on the hands or feet rather than skin folds.

Less Common but Clinically Important

Neurofibromas in patients with neurofibromatosis type 1 (NF1) can closely mimic large acrochordons. NF1 also produces cafe-au-lait macules and axillary freckling (Crowe sign), so the full skin exam guides the distinction. A pedunculated basal cell carcinoma is rare but reported, and it shares the neck location common to tags in older adults. Any tag that bleeds on contact or crusts deserves biopsy rather than in-office snipping [14].

Treatment Options for Skin Tags

Skin tags require no treatment for medical reasons. Removal is elected for cosmetic reasons or because a tag repeatedly catches on clothing or jewellery and causes irritation.

Office-Based Procedures

Snip excision is the fastest approach. The clinician applies topical or injectable lidocaine, then cuts the stalk with iris scissors at its base. A 2017 retrospective review of 1,204 snip excisions found a recurrence rate of approximately 3% at 12 months [15].

Cryotherapy uses liquid nitrogen at minus 196 degrees Celsius applied for 5 to 10 seconds. Two freeze-thaw cycles are standard for tags larger than 3 mm. The treated tissue sloughs within 7 to 14 days.

Electrodesiccation passes a low-current electrical charge through the tag, desiccating the tissue. It is particularly effective for thin-stalked tags under 2 mm. Mild scarring is possible on darker skin types (Fitzpatrick IV to VI), so cryotherapy may be preferred in those patients to reduce post-inflammatory hyperpigmentation risk.

Ligation ties a suture or commercial tie device tightly around the stalk, cutting off blood supply. The tag necrotizes and falls off within 7 to 10 days. A small randomized trial (N=98) published in Dermatologic Surgery found ligation and cryotherapy produced equivalent cosmetic outcomes at 3 months, with cryotherapy causing slightly more transient hypopigmentation [16].

At-Home Options and Their Limits

Over-the-counter ligation kits (TagBand and similar devices) are available without a prescription and are broadly safe for pedunculated tags with a clearly visible stalk. The FDA has not cleared any topical acid product specifically for skin tag removal, and anecdotal methods such as apple cider vinegar or tea tree oil lack controlled evidence [17]. Cutting or tying a lesion at home without confirming the diagnosis risks bleeding and infection from what might actually be a different lesion type.

What Not to Do

Self-removal of any lesion on the eyelid is dangerous given proximity to the globe. Tags near the anus or genitalia should be evaluated by a clinician before removal to exclude condylomata acuminata (anogenital warts caused by HPV types 6 and 11), which require different treatment.

The Metabolic Angle: Skin Tags as a Window Into Systemic Health

This section outlines a clinical decision framework developed by the HealthRX medical team for patients who present primarily with skin tags but may carry undiagnosed metabolic disease.

Tier 1 (1 to 4 tags, no metabolic risk factors): No workup needed beyond skin examination. Removal if desired.

Tier 2 (5 or more tags OR rapid new development OR coexisting acanthosis nigricans): Order fasting glucose, HbA1c, fasting lipid panel, and waist circumference. If PCOS is suspected, add fasting insulin, total testosterone, and LH/FSH ratio.

Tier 3 (tags in a patient under 30 with no obesity or insulin resistance, family history of renal tumors or thyroid disease): Refer to genetics for consideration of Birt-Hogg-Dube or Cowden syndrome. Order renal ultrasound if FLCN mutation is confirmed.

The Endocrine Society's 2021 clinical practice guideline on insulin resistance notes that dermatologic manifestations, including acrochordons and acanthosis nigricans, may precede laboratory confirmation of prediabetes by 2 to 5 years [18], making the skin a sometimes undervalued early warning system.

When Should You Be Concerned?

Most skin tags are benign and static. A subset of clinical features justify prompt evaluation.

Red Flags Requiring Same-Week Dermatology Referral

A tag that bleeds without trauma, changes color rapidly, grows larger than 1 cm, becomes fixed to underlying tissue, or appears ulcerated is not behaving like a typical acrochordon. These features prompt biopsy to exclude malignant transformation or a misdiagnosed primary lesion.

Monitoring for Metabolic Disease

A patient who notices a sudden crop of 10 or more new tags over a few months, particularly around the neck and axillae, should see their primary care physician within 4 weeks for metabolic screening. A 2019 cross-sectional study in Skin Research and Technology (N=315) found that patients with more than 10 acrochordons had a 3.8-fold higher odds of meeting criteria for metabolic syndrome compared to those with fewer than 5 tags [19].

Skin Tags During Pregnancy

Second-trimester estrogen and progesterone surges drive rapid connective tissue changes across the body. New acrochordons are common and generally resolve or shrink within 6 months postpartum. Treatment during pregnancy is usually deferred unless a tag becomes significantly irritated or infected, because local anesthetics and cryotherapy carry low but non-zero procedural risks in the first trimester [20].

Prevention: Can Skin Tags Be Avoided?

Friction reduction and metabolic control are the two levers available. Keeping skin folds dry with absorbent powders, wearing loose-fitting clothing, and maintaining a healthy BMI all reduce mechanical stimulation in high-risk areas. For patients with prediabetes, achieving even 5% to 7% weight loss has been shown in the Diabetes Prevention Program (N=3,234) to reduce progression to type 2 diabetes by 58% at 3 years [21]. Reducing insulin resistance does not guarantee fewer tags, but it addresses the most modifiable underlying driver.