A supernumerary nipple known as a third nipple, triple nipple, accessory nipple, is an additional nipple occurring in mammals, including human beings. third nipples are seen in humans also.
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.
If third nipple, increases the risk for breast cancer
. Any breast tissue , whether it appears in the standard location or elsewhere, is vulnerable to the same diseases that can affect typical breast tissue.
The presence of extra nipples is sometimes linked to heart defects and kidney