Supernumerary nipple or polythelia is a condition that is characterized by the presence of an extra nipple on the body, in addition to two on the breasts. Approximately 3% of the world's population have an extra nipple somewhere on their body. The condition affects men and women equally. While the condition is not really dangerous, the third nipple is usually fully capable of developing cancer. Interestingly, many people are generally unaware of the presence of an extra nipple on their body because it looks like a mole or rash!
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