In the embryonic stage, there are 6 ~ 8 pairs of mammary glands on the two lines from armpit to groin. Before birth, except for a pair on the chest, all the others degenerated.
Usually, only 1 pair of human mammary gland primordia located between the fifth ribs develops normally. If a pair of mammary primordia on the "mammary line" do not shrink in time and continue to develop, accessory mammary glands will be formed after birth.
It can occur unilaterally or bilaterally, usually in the front or lower part of armpit, and also in the upper and lower parts of normal breast, abdomen, groin, lateral thigh and other parts.
It can occur in both men and women, the incidence rate is 1-5%, and the ratio of male to female incidence rate is 1:5.
Extended data daily protection
1, diligently massage the chest, pay attention to the pinching skills?
Be diligent in massaging the chest, and pay attention to the skills of pinching and pushing when massaging.
2. Wear underwear that suits you.
Choosing the right underwear is the first step to prevent the generation of auxiliary milk. If you already have a pair of breasts, you should pay more attention to the choice of underwear. It should be based on the principle of increasing and widening the sides to completely cover the whole chest, or it should be adjustable underwear with corrective effect.
Baidu encyclopedia-auxiliary breast enhancement
Baidu encyclopedia-parts elimination