A skin tag (acrochordon) is a fleshy polyp composed of skin, fibrous tissue, and blood vessels. It is characteristically found on the neck, armpit, and inguinal (groin) creases of most adult humans at one time or another. When the blood supply at the base of the polyp becomes compromised, there may be pain associated with the tag as it dies. There is no particular medical reason to destroy these, but this is easily accomplished by freezing the skin tag with liquid nitrogen. On the other hand, patients have been known to tie a piece of thread around the base of the tag to shut off its blood supply.