Skin tags look like tiny bits of hanging skin and typically occur in sites where clothing rubs against the skin or where there is skin-to-skin friction, such as the underarms, neck, upper chest, and groin. Skin tags are not present at birth and their frequency increases with age. Skin tags can be observed in about 25% of adults. Studies have shown a genetic predisposition to the development of skin tags. Therefore, skin tags can run in families. A skin tag is medically termed an acrochordon.