Do some women really have a third nipple?

Are you sitting down? Good. Here's the truth: Some women (and men) have up to six nipples. "When a fetus is forming, it develops something called a milk line that's studded with nipples and runs from the armpits to the groin," says Michael Yang, M.D., an ob-gyn in Sunnyvale, Texas. "It looks like what dogs and cats have, but in humans it usually disappears before birth." Except when it doesn't. Sometimes supernumerary nipples come with extra tissue and develop like regular breasts; typically, though, they just sit on your skin—sans areolae—and look more like moles or skin tags than budding boobs. Not loving your extra teats? They can easily be removed with minor surgery.

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