Skin tags are small overgrowths of skin that most often develop in areas where skin or clothing causes friction, such as the underarms, neck, groin, or under the breasts. However, they can appear anywhere on the body, including delicate areas like the eyelids. Composed of skin fibers, nerve cells, and fat cells, skin tags resemble small tissue flaps protruding from the skin. They are typically asymptomatic and benign.