Nipple invagination means that the nipple is buried in the breast, which is called nipple invagination. Although young women's breasts swell, some people's nipples never stand up, but they are still buried in their breasts. They are distressed by this. When they go to the public bathroom, they are afraid that others will see that there are no nipples on their breasts and dare not take a bath. As long as we take some corrective measures in time, most invaginated nipples can protrude and the appearance of breasts can be restored.