Why Do Skin Tags Suddenly Appear? 6 Common Causes Doctors Talk About

Skin tags are small, soft, harmless growths that often appear to “suddenly” show up on the skin—but in reality, they usually develop gradually over time. Dermatologists explain that they are very common, especially in adulthood, and tend to form in areas where skin folds or rubs together, such as the neck, underarms, groin, or under the breasts.

Here are six common causes doctors often mention:

1. Skin friction
Repeated rubbing of skin against skin or clothing is one of the most common triggers. This friction can stimulate small clusters of skin cells to grow outward, forming a tag.

2. Aging
As the body ages, the skin naturally changes in structure and elasticity. These changes make it more likely for benign growths like skin tags to develop over time.

3. Hormonal changes
Hormonal fluctuations—such as those during pregnancy or other life stages—can influence how skin cells grow and repair, sometimes leading to new skin tags.

4. Body weight and skin folds
Increased body weight can create more skin folds, which increases friction in certain areas. This can contribute to the development of skin tags.

5. Insulin resistance
Some studies suggest a possible link between skin tags and insulin resistance. Because of this, doctors may sometimes check blood sugar levels if someone develops multiple skin tags.

6. Genetics
Skin tags often run in families. If close relatives have them, there’s a higher chance you may develop them as well.

In most cases, skin tags are harmless and don’t require treatment. However, it’s a good idea to consult a doctor or dermatologist if a growth changes in appearance, becomes painful, bleeds, or grows quickly.

They can confirm the diagnosis and recommend safe removal options if needed.