What should you know about a skin tag under the armpit?

Skin tags, also called acrochordons, are small pieces of extra skin that may hang from a narrow base or sit on a broader base. The armpit is a common friction area, so rubbing from clothing, skin movement, or shaving can make one sore, red, or prone to snagging. A bump that is firm, deeply attached, rapidly changing, persistently bleeding, or very different from nearby skin may be something other than a skin tag.

Do not cut, tie off, burn, or freeze an underarm growth at home. These approaches can cause bleeding, infection, scarring, or confusion about the diagnosis. Keep the area clean and reduce rubbing with comfortable clothing while arranging a skin examination if the growth is bothersome. After assessment, a clinician may discuss removal, including cryotherapy, electrosurgery, or a small procedure suited to the growth’s position and attachment.

Arrange a prompt appointment if the bump changes quickly, bleeds without being rubbed, develops an ulcer, becomes increasingly painful, or has marked swelling or discharge. Seek urgent help for heavy bleeding, spreading redness with fever, or sudden severe pain. A clinician can examine the lesion directly and decide whether it fits a skin tag before any treatment.

Ask whether the growth has the typical appearance of a skin tag, which removal method fits an underarm site, how to protect the area while it heals, and which changes should trigger a follow-up visit.