Learn About What Causes Skin Tags

What Are Skin Tags and Why Do They Form

Skin tags are small, soft growths that hang from the skin, usually connected by a thin stalk. They're also called acrochordons or fibroepithelial polyps in medical terms. These growths are benign, meaning they're not cancerous and don't develop into cancer. Skin tags vary in appearance—some are flesh-colored, while others may be darker or slightly pigmented. They typically range in size from a few millimeters to about a centimeter across, though some can grow larger.

The structure of a skin tag contains loose collagen fibers and blood vessels surrounded by skin. When examined under a microscope, skin tags show a core of loose connective tissue covered by normal skin. This composition explains why they feel soft and why they can bleed if irritated or pulled. Skin tags most commonly appear in areas where skin rubs against skin or where clothing creates friction, such as the neck, armpits, groin, and under the breasts.

Research suggests that skin tags form when there's repetitive friction or irritation in a specific area. The constant rubbing causes skin cells to proliferate in that spot, creating the characteristic stalk-like growth. While some people develop just one or two skin tags in their lifetime, others may develop dozens. The frequency of skin tags increases with age, which is why they're more common in middle-aged and older adults than in younger people.

Understanding what skin tags are helps distinguish them from other skin conditions that might require medical treatment. Unlike moles or warts, skin tags don't have roots that extend deep into the skin. This makes them generally easier to remove if someone chooses to do so. However, because they contain blood vessels, attempting to remove them at home can lead to bleeding and infection.

Practical takeaway: Skin tags are harmless, benign skin growths that become more common with age. Knowing their basic structure and composition helps you recognize them and understand why they occur in friction-prone areas of the body.

Genetic and Hereditary Factors in Skin Tag Development

Genetics play a significant role in whether someone develops skin tags. If your parents or close relatives had skin tags, you're more likely to develop them as well. Studies of families have shown that skin tag formation runs in families, suggesting that certain genetic traits make some people more susceptible. This doesn't mean you will definitely develop skin tags if your relatives have them, but it does increase your likelihood.

The genetic component may relate to how your skin responds to friction or how collagen forms in your skin. Some people's skin naturally produces excess collagen in response to irritation, while others' skin responds differently. This variation in collagen production appears to be inherited. Additionally, genetic factors may influence your skin elasticity and thickness, both of which can affect whether skin tags develop when friction occurs.

Research on families shows that if both parents have skin tags, their children have a higher chance of developing them too. Twin studies have also provided information about the genetic influence—identical twins are more likely to both have skin tags than fraternal twins, further confirming the hereditary nature. However, environmental and lifestyle factors also matter, which is why genetic predisposition doesn't guarantee that someone will develop skin tags.

Age of onset can also be influenced by genetics. Some people begin developing skin tags in their 30s or 40s, while others may not develop them until later in life. This variation in timing also appears to have a genetic component. Additionally, some genetic conditions are associated with increased skin tag formation, though this is relatively uncommon in the general population.

Understanding your family history can give you insight into your own risk. If you have close relatives with skin tags, you might be more vigilant about managing the factors that contribute to their development, such as friction and weight management. This awareness can help you take preventive steps earlier if desired.

Practical takeaway: Genetics significantly influence skin tag development, with family history being a strong predictor. If your relatives have skin tags, you may be more likely to develop them, though this is not guaranteed and can be influenced by other factors.

Friction, Rubbing, and Mechanical Irritation as Primary Causes

Friction is widely recognized as a primary cause of skin tag formation. Anywhere on your body where skin rubs against skin, or where clothing repeatedly rubs against skin, creates the ideal environment for skin tags to develop. This explains why they commonly appear in skin folds and areas of movement. The neck is particularly prone to skin tags because it experiences constant friction from clothing, jewelry, and the movement of your head. Similarly, armpits develop skin tags because of the friction created by arm movement and sometimes by tight clothing.

The groin area and inner thighs are frequent sites for skin tag development because these areas experience significant friction during movement and from clothing. Overweight individuals may develop skin tags more frequently in these areas because excess skin creates additional friction. Under the breasts is another common location, especially in women, because of the constant friction from bra straps and movement. The eyelids can also develop skin tags due to the frequent blinking and rubbing that occurs naturally.

When skin experiences repetitive friction or rubbing, the skin cells respond by proliferating. The body's response to this irritation includes increased blood flow to the area and increased cell growth. Over time, this chronic irritation causes the characteristic growth of a skin tag. The friction doesn't cause pain or obvious damage, which is why many people don't realize they're developing skin tags until they become visible or noticeable by touch.

Certain behaviors can increase friction-related skin tag formation. Tight clothing that rubs in the same spot repeatedly, rough fabrics, and jewelry that catches or rubs the skin all contribute. People who exercise frequently in tight clothing may notice more skin tags in areas where their clothing creates friction during movement. Similarly, people who wear tight bras, waistbands, or collars may develop skin tags in those specific locations.

Preventing friction-related skin tags involves managing the mechanical irritation. Wearing looser clothing, using anti-chafe products, and keeping skin dry in fold areas can reduce the likelihood of skin tag formation. For people at high risk due to genetics or other factors, minimizing friction may be one of the most practical preventive approaches available.

Practical takeaway: Repetitive friction from clothing, skin-on-skin contact, and movement is a major cause of skin tags. Reducing friction through loose clothing and proper care in prone areas may help prevent their formation.

How Weight, Age, and Hormonal Changes Contribute

Body weight significantly influences skin tag development. Overweight and obese individuals develop skin tags at higher rates than people at lower weights. This occurs for several reasons: excess weight increases the amount of skin folding and friction, creates more areas where skin rubs against skin, and puts additional stress on the skin from weight distribution. The relationship between weight and skin tags is so well-established that dermatologists regularly note BMI (body mass index) when assessing skin tag frequency.

As people age, skin tag development increases noticeably. Skin tags are rare in children and young adults but become increasingly common starting in the 30s and 40s. By age 60, surveys show that 46% to 59% of the general population has at least one skin tag. This age-related increase likely results from a combination of factors: cumulative friction over decades, decreased skin elasticity with age, and changes in collagen production. Older skin may be more susceptible to forming these growths when exposed to the same irritants that younger skin might resist.

Hormonal changes play a notable role in skin tag development, particularly in women. Pregnancy is associated with increased skin tag formation, likely due to a combination of hormonal changes, weight gain during pregnancy, and increased friction from skin stretching and folding. Women often notice new skin tags appearing during or after pregnancy. Hormonal changes during menopause may also contribute to skin tag formation in some women. The exact mechanism of how hormones influence skin cell growth in this context remains an area of ongoing research.

Insulin resistance and metabolic conditions may contribute to skin tag development. Some research suggests that people with insulin resistance or type 2 diabetes develop skin tags at higher rates. This association may relate to metabolic changes affecting skin cell growth and collagen production. Additionally, people with metabolic syndrome often have the weight and friction factors that independently contribute to skin tag formation.

Understanding these factors helps explain why skin tag development varies so much from person to person. Someone who is younger, at a healthy weight