A supernumerary nipple (also known as a third nipple, accessory nipple, polythelia or polymastia) is an additional nipple occurring in mammals including humans. Often mistaken for moles, supernumerary nipples are diagnosed at a rate of 2% in females, less in males. 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. Polythelia refers to the presence of an additional nipple alone while polymastia denotes the much rarer presence of additional mammary glands.
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In popular culture
Actor and singer Mark Wahlberg is seen to have such a nipple below his left breast in his modelling photographs.
Fictional characters said to have 'a third nipple' include:
* The assassin Francisco Scaramanga from the book and movie The Man with the Golden Gun
* Chandler Bing from the Friends television show (he refers to it as his "nubbin" but eventually has it removed).
* Dr. Noah Faulkner in the film Biodome
* Miss Ivannah from the movie Mallrats (although this is a fake – after the protagonists leave her shop, she peels the fake third nipple from her breast and eats it.)
* Krusty the Clown from The Simpsons television show
* Malcolm's classmate in Malcolm in the Middle episode 314 "Cynthia's Back" which aired 17 February 2002. Line: "I wonder if my third nipple can get me out of
