Skin tags are small non cancerous tumors that form primarily in areas where the skin forms creases, such as the neck, armpits, and groin. They also occur on the face, usually on the eyelids. The surface of skin tags may be smooth or irregular in appearance. Often, they are raised from the surface of the skin on a fleshy stalk. Skin tags are harmless, although they are sometimes irritated by clothing or jewelry. Why and how skin tags form is not entirely known, but there are correlations with age and obesity. They are more common in people with diabetes and in pregnant women.