Why do skin tags form

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Last updated: April 8, 2026

Quick Answer: Skin tags, medically known as acrochordons, are benign skin growths that typically form in areas where skin rubs against skin or clothing, such as the neck, armpits, and groin. They are composed of collagen fibers and blood vessels surrounded by skin, and their formation is often linked to friction, hormonal changes, and insulin resistance. While they can appear at any age, they become more common after age 40, affecting approximately 25-50% of adults. Most skin tags are harmless and do not require treatment unless they cause discomfort or cosmetic concerns.

Key Facts

Skin tags affect approximately 25-50% of adults, with prevalence increasing with age
They are most common in individuals over age 40, though can occur at any age
Skin tags are associated with insulin resistance and metabolic syndrome, with studies showing up to 75% of people with diabetes develop them
They typically range from 1-5 mm in size, though can grow larger
Removal methods include cryotherapy, surgical excision, and cauterization, with recurrence rates under 10%

Overview

Skin tags, medically termed acrochordons, are small, soft, benign skin growths that have been documented since ancient times, with descriptions appearing in medical texts dating back to the 16th century. These common skin lesions typically appear as flesh-colored or slightly darker protrusions attached to the skin by a thin stalk called a peduncle. While they can develop anywhere on the body, they most frequently occur in areas where skin experiences friction, such as the neck, armpits, groin, under breasts, and eyelids. The prevalence of skin tags increases significantly with age, affecting approximately 25-50% of adults, with higher incidence in middle-aged and older populations. Historically, skin tags were often confused with other skin growths, but modern dermatology has established clear diagnostic criteria distinguishing them from moles, warts, and other dermatological conditions.

How It Works

Skin tags form through a combination of mechanical and biological factors. The primary mechanism involves friction between skin surfaces or between skin and clothing, which stimulates the proliferation of collagen fibers and blood vessels in the dermis. This friction causes the outer layer of skin (epidermis) to grow over these fibrous tissues, creating the characteristic pedunculated structure. Hormonal influences play a significant role, particularly during pregnancy and in conditions like polycystic ovary syndrome (PCOS), where increased hormone levels can trigger growth. Additionally, insulin resistance and metabolic syndrome are strongly associated with skin tag development, as elevated insulin levels may promote cell growth in skin tissues. The growth process typically begins with a small bump that gradually enlarges over weeks to months, with most skin tags reaching their final size of 1-5 mm within several months of formation.

Why It Matters

Understanding skin tag formation matters for several practical reasons in healthcare and daily life. While generally harmless, skin tags can cause discomfort when irritated by clothing or jewelry, and their appearance may lead to cosmetic concerns affecting self-esteem. In clinical practice, the presence of multiple skin tags can serve as an external marker for underlying metabolic conditions, particularly insulin resistance and type 2 diabetes, prompting further medical evaluation. From a public health perspective, the high prevalence of skin tags (affecting millions worldwide) makes them a common reason for dermatological consultations, with removal procedures representing a significant portion of minor dermatological surgeries. Proper identification is crucial to distinguish them from potentially malignant growths, preventing unnecessary anxiety while ensuring appropriate monitoring of suspicious lesions.