Why Do Skin Tags Form? The Science Behind It

Skin tags are small, soft growths of skin that hang off the body by a thin stalk. They are incredibly common, and they are not dangerous. They form when clusters of collagen and blood vessels become trapped inside thicker areas of skin, most often where skin rubs against skin or clothing.

Why Do Skin Tags Form?

Friction is the main driver. Skin tags appear in places where skin constantly rubs against itself, such as the neck, armpits, groin, and under the breasts. This repeated friction causes the skin cells to overgrow in a localized area, creating a small outpouching of tissue.

Inside the tag, you will find a core of collagen fibers and blood vessels covered by a layer of epidermis, which is the outer layer of skin. The stalk, or peduncle, that connects the tag to the rest of your skin contains the blood supply. This is why skin tags bleed when they are cut or torn off.

Are Skin Tags a Sign of a Health Problem?

For most people, skin tags are simply a cosmetic nuisance. They are benign growths, meaning they are not cancerous and do not turn into cancer. Their presence alone does not indicate a serious internal disease.

However, they are associated with certain metabolic conditions. Research consistently shows a link between skin tags and insulin resistance, a condition where your body’s cells do not respond normally to insulin. This connection is strong enough that some doctors view multiple skin tags as a visible clue to check for type 2 diabetes or prediabetes, especially in younger patients.

Skin tags are also more common in people who are overweight or obese. This is partly because excess weight increases skin folds and friction. The metabolic changes that often come with higher body weight also appear to play a role in their development.

Who Gets Skin Tags and Where Do They Appear?

Skin tags can develop at any age, but they are most common after age 40. They affect men and women equally, though pregnancy can trigger their growth due to hormonal changes and weight gain.

The most common locations are:

• Eyelids
• Neck
• Underarms
• Groin area
• Under the breasts
• Upper chest

These areas share one thing in common: they are sites of repeated friction. Skin tags rarely appear on the palms of the hands or soles of the feet.

Genetics also play a role. If your parents had skin tags, you are more likely to develop them. Some rare genetic conditions cause numerous skin tags to appear at a young age, but for most people, the growths are sporadic and few in number.

How Are Skin Tags Different From Moles and Warts?

People often confuse skin tags with moles or warts, but they are distinct growths. Skin tags are soft, fleshy, and usually match your skin color. They hang off the skin on a thin stalk and are typically painless.

Moles are flat or raised and are made of pigment-producing cells called melanocytes. They are usually brown or black and do not hang off the skin on a stalk. Warts are caused by the human papillomavirus (HPV). They are rough, firm, and can have tiny black dots, which are clotted blood vessels. Warts are contagious; skin tags are not.

If you are unsure what a growth is, a dermatologist can identify it with a quick visual exam. This matters because treatments differ for each type of growth.

Can You Prevent Skin Tags From Forming?

There is no guaranteed way to prevent skin tags. Because friction is a primary cause, reducing skin-on-skin rubbing may help some people. Keeping skin folds dry, wearing loose clothing, and maintaining a healthy weight can reduce the conditions where skin tags thrive.

For people with insulin resistance or diabetes, managing blood sugar levels may reduce the likelihood of new tags forming. Some studies suggest that improving metabolic health is associated with fewer skin tags, though the evidence is not strong enough to promise prevention.

No cream, ointment, or supplement has been proven to prevent skin tags. Products marketed for this purpose lack clinical evidence. The same applies to essential oils and home remedies claiming to stop skin tags before they start.

What Are the Treatment Options for Skin Tags?

Skin tags do not require treatment. If they do not bother you, they can be left alone safely. They will not turn into cancer, and they will not spread to other parts of your body.

If you want them removed for cosmetic reasons or because they catch on clothing or jewelry, a doctor can remove them quickly. Common methods include:

• Cryotherapy: Freezing the tag with liquid nitrogen, which causes it to fall off within days.
• Cauterization: Burning the tag off with an electric current.
• Surgical snip: Cutting the tag off with sterile scissors or a scalpel after numbing the area.
• Ligation: Tying off the base with surgical thread to cut off the blood supply, causing the tag to wither and drop off.

These office procedures are quick, usually require no downtime, and carry a low risk of infection or scarring when performed by a professional.

The evidence is less clear for at-home removal. Over-the-counter freezing kits and creams are available, but they are not as precise as professional treatment. Applying them incorrectly can damage the surrounding healthy skin or leave a scar. The American Academy of Dermatology advises against removing skin tags at home with scissors or nail clippers because of the risk of bleeding and infection.

When Should You See a Doctor About a Skin Growth?

Most skin tags are harmless, but you should have any new or changing growth examined by a doctor. See a dermatologist if a growth:

• Changes in color, size, or shape
• Bleeds without injury
• Becomes painful or itchy
• Grows rapidly
• Has an irregular border or multiple colors

These features can indicate a different type of skin lesion, including skin cancer. A doctor can distinguish between a benign skin tag and something more serious. When in doubt, professional evaluation is the safest course.

Sudden appearance of many skin tags, especially alongside symptoms like increased thirst, frequent urination, or unexplained fatigue, could suggest undiagnosed diabetes. In this case, a medical checkup is appropriate.

Skin tags are a normal part of aging for many people. Understanding why they form — friction, genetics, and metabolic factors — helps separate fact from the many myths about their causes. They are not caused by poor hygiene, and they are not contagious. They are simply a common, benign skin finding that most people can safely ignore.