Skin Tags: What Labs to Get and Clinical Next Steps

What Skin Tags Actually Are

Acrochordons, the clinical name for skin tags, are soft, pedunculated (stalk-based) growths of normal skin that protrude from friction-prone areas. They consist of a fibrovascular core covered by epidermis. Most measure 1 to 5 mm, though some grow larger.

They are extremely common. A cross-sectional study published in the International Journal of Dermatology found that 46% of a sample population had at least one acrochordon, with prevalence climbing sharply after age 40 1. The neck, axillae, eyelids, and inframammary folds are the most frequent locations because of skin-on-skin contact and moisture. Pregnancy can trigger new skin tags due to hormonal shifts and increased growth factor activity.

They pose zero malignant risk. No documented case series has shown transformation of a true acrochordon into melanoma or squamous cell carcinoma. The reason clinicians pay attention to them is not the skin tag itself but what it may reveal about a patient's metabolic health.

Why Skin Tags Signal Insulin Resistance

The strongest and most reproducible association in the literature is between multiple skin tags and hyperinsulinemia. Insulin and insulin-like growth factor 1 (IGF-1) bind to receptors in keratinocytes and dermal fibroblasts, stimulating proliferation. When circulating insulin is chronically elevated, as in insulin resistance, skin cell turnover accelerates in friction zones. The result is visible: small, fleshy outgrowths.

Tamega et al. studied 98 patients with skin tags and 103 controls, finding that acrochordon patients had significantly higher HOMA-IR values (a mathematical index of insulin resistance) and fasting insulin levels 2. Rasi et al. confirmed that skin tags were an independent marker for impaired carbohydrate metabolism even after adjusting for BMI 1. Kahana et al. published one of the earliest controlled studies identifying skin tags as a "cutaneous marker for diabetes mellitus" in Acta Dermato-Venereologica 3.

The American Diabetes Association's 2024 Standards of Care note that certain dermatologic findings, including acanthosis nigricans and skin tags, should prompt clinicians to screen for prediabetes and type 2 diabetes 4.

"Skin tags are a visible, no-cost screening clue," wrote Dr. M. A. Crook in the Journal of Clinical Pathology. "Their presence, especially in clusters, should lower the threshold for metabolic investigation" 5.

The Lab Panel Every Skin Tag Patient Should Request

If you have multiple skin tags, particularly five or more, a targeted metabolic workup can catch conditions years before symptoms appear. Here is what to ask your clinician to order.

Fasting glucose. A value of 100 to 125 mg/dL defines impaired fasting glucose (prediabetes). Above 126 mg/dL on two separate tests confirms diabetes per ADA criteria 4.

HbA1c. This reflects average blood sugar over 2 to 3 months. An HbA1c between 5.7% and 6.4% is prediabetic. At or above 6.5% is diabetic. In the Tamega et al. cohort, mean HbA1c was significantly higher in the skin tag group (5.6% vs. 5.1%) 2.

Fasting insulin. Standard metabolic panels do not include this. You need to request it specifically. A fasting insulin above 15 to 20 µIU/mL suggests resistance, though lab reference ranges vary. The HOMA-IR calculation (fasting insulin × fasting glucose / 405) gives a more useful single number. Values above 2.5 are generally considered insulin resistant.

Lipid panel. Crook's research linked multiple skin tags to an atherogenic lipid profile: elevated triglycerides, low HDL cholesterol, and a high triglyceride-to-HDL ratio 5. Gorpelioglu et al. confirmed these findings, reporting that patients with skin tags had significantly higher serum triglycerides (mean 168 mg/dL) compared to controls (mean 118 mg/dL) 6.

Optional but useful: serum leptin, thyroid panel (TSH, free T4), and sex hormone levels (testosterone, DHEA-S, SHBG). Polycystic ovary syndrome (PCOS) in women frequently co-occurs with skin tags due to shared insulin-resistant pathophysiology.

Interpreting Your Results: A Decision Framework

Not every skin tag demands a full endocrine workup. Here is how to triage based on clinical context and lab values.

Low-risk profile: Fewer than three skin tags, normal BMI, fasting glucose below 100 mg/dL, HbA1c below 5.7%, lipid panel within range. No further workup needed. Removal is optional and purely cosmetic.

Moderate-risk profile: Three to five skin tags, BMI 25 to 29.9, fasting glucose 100 to 115 mg/dL, or HbA1c 5.7% to 5.9%. Repeat labs in 6 months. Start lifestyle modification: 150 minutes per week of moderate exercise, 5% to 7% weight loss target. The Diabetes Prevention Program (DPP) trial demonstrated that structured lifestyle intervention reduced progression from prediabetes to diabetes by 58% over 2.8 years 7.

High-risk profile: Five or more skin tags, acanthosis nigricans present, BMI 30+, fasting glucose above 115 mg/dL, HbA1c 6.0% to 6.4%, triglycerides above 150 mg/dL, HDL below 40 mg/dL (men) or 50 mg/dL (women). Refer to endocrinology. Consider metformin per ADA guidelines for high-risk prediabetes. A GLP-1 receptor agonist may be appropriate if BMI exceeds 27 with comorbidities.

The Endocrine Society's 2022 Clinical Practice Guideline on obesity pharmacotherapy states: "Patients with BMI ≥27 kg/m² and at least one weight-related comorbidity, including insulin resistance, are candidates for pharmacologic intervention" 8.

Other Conditions Linked to Skin Tags

Insulin resistance is the primary driver, but several other conditions overlap.

Metabolic syndrome. Defined by the presence of three or more of: waist circumference above 102 cm (men) or 88 cm (women), triglycerides above 150 mg/dL, HDL below 40 mg/dL (men) or 50 mg/dL (women), blood pressure above 130/85, and fasting glucose above 100 mg/dL. Sari et al. reported that patients with skin tags had a significantly higher prevalence of metabolic syndrome compared to age-matched controls (44% vs. 18%) 9.

PCOS. Hyperandrogenism and insulin resistance drive skin tag formation in women with PCOS. Rotterdam criteria identify the syndrome. Relevant labs: total and free testosterone, DHEA-S, SHBG, and a 2-hour oral glucose tolerance test.

Acromegaly. Rare but worth noting. Excess growth hormone directly stimulates fibroblast proliferation. Patients present with coarsening of facial features, widened hands and feet, and diffuse skin tags. An IGF-1 level screens for this condition 10.

Pregnancy. Estrogen and progesterone surges, combined with weight gain and increased skin friction, produce skin tags in up to 20% of pregnancies. These often regress postpartum and do not require metabolic workup unless other risk factors exist.

Crohn's disease. Perianal skin tags occur in roughly 26% of Crohn's patients and are considered a clinical marker of disease activity. These are distinct from typical friction-zone acrochordons and should prompt gastroenterology referral if accompanied by pain, fissures, or altered bowel habits 11.

When to See a Specialist

Most skin tags do not require specialist evaluation. A primary care visit covers the lab workup and any needed removal. But certain findings change the calculus.

See a dermatologist if a skin tag changes color, bleeds spontaneously, grows rapidly, or has an irregular base. These features do not describe typical acrochordons and could indicate a different pathology, including seborrheic keratosis, neurofibroma, or (rarely) amelanotic melanoma. A shave biopsy takes 5 minutes and provides a definitive histologic diagnosis.

See an endocrinologist if your labs reveal an HbA1c above 6.0%, fasting insulin above 25 µIU/mL, a HOMA-IR above 3.0, or if you meet criteria for metabolic syndrome. These findings require structured management that goes beyond "eat less and exercise more."

See a gastroenterologist if skin tags cluster perianally and you have concurrent GI symptoms: chronic diarrhea, abdominal pain, rectal bleeding, or unintentional weight loss. Perianal skin tags in isolation can be benign, but the combination with GI complaints warrants colonoscopic evaluation.

Removal Options and What Insurance Covers

Skin tag removal is classified as cosmetic by most insurers unless the growth is symptomatic (bleeding, painful, or interfering with function). Self-pay costs are modest.

Snip excision. The clinician numbs the base with lidocaine, lifts the tag with forceps, and cuts it at the stalk with iris scissors. Healing takes 5 to 7 days. This is the fastest method for tags 2 mm or larger.

Cryotherapy. Liquid nitrogen applied for 5 to 10 seconds freezes and destroys the tag. It blisters, then falls off within 1 to 2 weeks. Best for small (<3 mm) or multiple tags in one session.

Electrodesiccation. A fine-tip cautery instrument destroys the tag at its base. Minimal bleeding. Most useful for larger pedunculated tags where hemostasis is a concern.

Do not tie off skin tags with thread, dental floss, or rubber bands at home. Incomplete ligation can cause infection, incomplete necrosis, or scarring. Over-the-counter freezing kits (dimethyl ether/propane mixtures) are less effective than clinical liquid nitrogen because they reach only about negative 57°C versus negative 196°C.

GLP-1 Agonists, Weight Loss, and Skin Tag Recurrence

Because insulin resistance is the root driver for most people with multiple skin tags, treatments that reduce insulin resistance can slow or stop new tag formation. This is not speculative. The mechanism is direct: lower circulating insulin means less epidermal growth factor stimulation.

In the STEP 1 trial (N=1,961), participants receiving semaglutide 2.4 mg weekly lost a mean of 14.9% body weight at 68 weeks versus 2.4% with placebo 12. That degree of weight loss substantially reduces HOMA-IR. The SCALE Insulin Resistance substudy showed that liraglutide 3.0 mg improved HOMA-IR by 1.7 points on average over 56 weeks 13.

No randomized trial has measured skin tag recurrence as a primary endpoint. This is a data gap. But the mechanistic logic is clear, and HealthRX clinicians observe reduced new skin tag formation in patients whose insulin sensitivity improves with GLP-1 therapy or structured weight loss programs.

"We do not treat the skin tag. We treat the metabolic environment that produced it," said Dr. Caroline Apovian, past president of The Obesity Society and professor of medicine at Harvard Medical School.

Metformin (starting dose 500 mg twice daily, titrated to 2 to 000 mg daily) remains a first-line insulin sensitizer for patients who are not candidates for GLP-1 therapy. The DPP trial showed that metformin reduced diabetes incidence by 31% compared to placebo over 2.8 years 7.

A Practical Action Plan

If you are reading this because you have noticed skin tags, here is a concrete sequence of steps.

First, count and map your skin tags. Note location, size, and whether any have changed recently. Photograph them so you can track changes over time.

Second, schedule a primary care visit. Request the lab panel described above: fasting glucose, HbA1c, fasting insulin, and lipid panel. If you are a woman with irregular periods or hirsutism, add testosterone, DHEA-S, and SHBG.

Third, if your labs show prediabetes (HbA1c 5.7% to 6.4%) or insulin resistance (HOMA-IR above 2.5), begin lifestyle modification immediately. The evidence base from the DPP trial supports 150 minutes per week of brisk walking and a 7% body weight loss goal as the single most effective intervention 7.

Fourth, discuss pharmacotherapy if lifestyle changes alone are insufficient after 3 to 6 months, or if your metabolic risk profile is high at baseline. Metformin, GLP-1 receptor agonists (semaglutide, tirzepatide), or both may be appropriate depending on your BMI and comorbidity profile.

Fifth, remove bothersome skin tags at your clinician's discretion. This is the least important step medically but often the most motivating one for patients. New skin tags will continue to appear if the underlying metabolic driver is not addressed.

Recheck labs at 6 months after starting treatment. A falling HOMA-IR and HbA1c confirm that the metabolic environment is improving. Track whether new skin tags slow or stop forming during that interval.