Hello, mild nipple invagination can make the nipple protrude from the areola plane through massage stimulation or traction. Irreversible nipple inversion, that is, severe nipple inversion, can only be corrected by surgery. The correction of nipple invagination is to completely release the muscle fiber bundle pulled by invagination, fill the surrounding tissue under the nipple, enhance the support of the nipple, and make the nipple bulge and reshape.