The secondary breast is the residual breast tissue or fat accumulation, there is a certain congenital, while the side breast is usually due to the improper choice of underwear and is mostly formed later in life.
There is a difference between real and fake side breasts. Real side breasts are usually formed when the breast tissue in the armpit does not completely degenerate during the embryonic development period, and some of them may also have residual nipple traces, and they still have the function of lactation during the breastfeeding period. And with the physiological changes of women, there will be swelling or pain.
False side breasts are usually localized bulges in the armpits, mostly caused by the thickening of the fat layer.
Side breasts are usually formed when the normal breasts are squeezed and spread to both sides due to improper choice of underwear.
Usually, the side breasts do not need to be treated, as long as you maintain a healthy life, do not squeeze too much, participate in sports, and eat more coarse grains, fresh fruits and vegetables. However, if the secondary breast if larger, or combined with pain, nodules, etc., need to be treated.