Skin tags are normal outgrowths of skin that usually develop in areas where there is some friction on the skin surface. Examples are where clothing rubs around the neck, under arms, beneath the breasts, on the upper inner thighs, or on the eyelids.
There seems to be an inherited tendency to develop these growths and they are very common. They usually appear in adulthood as multiple soft flesh-colored to brown growths that are usually only attached to the skin surface by a thin stalk. Typically, they range from one to 5 mm, but occasionally they can become very large.