Acrochordons, aka skin tags, are small benign skin 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. They range in size from rice to golf ball size. The surface of skin tags may be smooth or irregular in appearance. Most often they are raised from the surface of the skin on a fleshy stalk called a peduncle. This stalk is why skin tags are also called pedunculated papillomas. Microscopically, a skin tag consists of a fibrovascular core (a small artery and vein in the stalk of skin) and sometimes some fat cells covered by an unremarkable epidermis.
Skin tags are harmless. Sometimes they are irritated by clothing or jewelry and can interfere with shaving and other routine grooming. It is not entirely known as to why or how skin tags form, but there are correlations with age and obesity. They are more common in people with diabetes and in pregnant women. It is estimated that by age 70, up to 59 percent of people have them. A genetic component (causation) is thought to exist.