Accessory breast - Wikipedia - A person with three breasts
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Accessory breasts, also known as polymastia, supernumerary breasts, or mammae erraticae, Contents. 1 Presentation; 2 Cause; 3 See also; 4 References; 5 External links. Sometimes the third breast is merely a nipple or vestige of a nipple, hardly chromosomal disorder as some people could have an extra digits while each hand.