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A supernumerary nipple (also known as a third nipple, triple nipple, accessory nipple, polythelia or the related condition: polymastia) is an additional nipple occurring in mammals, including humans. Often mistaken for moles, supernumerary nipples are diagnosed at a rate of 1 in 18 males and 1 in approximately 50 female humans.
The nipples appear along the two vertical "milk lines", which start in the armpit on each side, run down through the typical nipples and end at the groin. They are classified into eight levels of completeness from a simple patch of hair to a milk-bearing breast in miniature
Extra nipples are thought to be an evolutionary throwback. But how far back, exactly? Primates in general have only two nipples. We have to go back several tens of millions of years, to the common ancestors of primates and other mammals, to find species with rows of nipples, as we now see in pigs, cats and dogs. But primates clearly "remember" the milk line. It is evident in embryonic development, and it is also evident in the location of the regular nipples. Whereas humans and most primates have their two nipples near the top end of the milk line, a few primates, like the endangered aye-aye of Madagascar, have them at the bottom end, in the groin. Like cows.
Originally posted by isyeye
I personally know a guy that has six nipples, so I know that it is something that does exist, and is more common than most people realize.