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What a skin tag is
A skin tag — acrochordon, medically — is a soft flap of tissue: loose collagen fibres and small blood vessels enclosed in skin, usually attached by a narrow stalk. Most are the size of a grain of rice, though some grow larger.
They favour places where skin meets skin or fabric: the sides of the neck, underarms, eyelids, under the bust, and the groin. Friction is the common denominator.
They become more frequent with age and are associated with weight change, pregnancy, and insulin resistance. A sudden crop of many new tags is worth mentioning to your physician — not because the tags are harmful, but because of what they can accompany.