The secondary breasts are extra breasts in addition to the normal pair of breasts and are commonly found in the armpits. The breasts of the human body in addition to the normal pair of breasts appear extra breasts, most commonly found in the armpits and armpits. Usually there are no clinical symptoms, but some people may have swelling and pain before menstruation, or even swelling and bulging in the armpit and axilla, which is commonly seen as nipple-like bulging. It may be caused by congenital developmental abnormality, and paratesticular breast enlargement may also appear due to hormonal changes in the body between breastfeeding and pregnancy in women. If there are no obvious discomfort symptoms, no treatment can be taken, and you should pay attention to loose and breathable clothing, avoid tight underwear, and have regular checkups. If the breasts are large, painful and lumpy, then mastectomy and liposuction can be performed.