Polymastia

Polymastia is the existence of more than two breasts in mammals. Sporadic cases occur in humans.

Each "extra" is called the "supernumerary breast" and it has an abnormal situation, although it is almost always located within an imaginary line located on each side of the human body, from the apex of the armpit to the lateral face of the labia majora of the vulva (base of the scrotum in the male) of the same side. The presence of supernumerary nipples is known as polythelia.