Some girls are shy about breast development, so they wear tight underwear to tighten their breasts, or wear bras that are too small too early, and the developing breasts will be squeezed and flattened; At the same time, the poor blood circulation and insufficient nutrition supply of the oppressed breast will affect the normal development of the breast; The nipple is also deeply immersed in the breast due to being squeezed, forming nipple invagination. Straight breasts are the focus of women's beauty, and nipples are the "delicate points" in the focus. If nipple invagination is found, women had better correct it in time. The degree of nipple invagination varies, some only show nipple invagination, and the most serious performance is nipple depression or even inversion. Clinically, nipple invagination can be divided into three types: type ⅰ: nipple invagination exists in the nipple neck, and the invaginated nipple can be easily squeezed out by hand, and the size of the squeezed nipple is similar to that of ordinary people; Type Ⅱ: All nipples are depressed in areola, but they can be squeezed out by hand. Nipples are smaller than normal, and most of them have no nipple neck. Type ⅲ: The nipple is completely buried under the areola, and the invaginated nipple cannot be squeezed out. Nipple invagination not only hinders the beauty and lactation function of the breast, but also is difficult to clean locally. The concave part is easy to shelter evil people and shelter evil people, which often causes local infection. The mammary duct is connected with the concave part, and inflammation can spread into the breast, causing mastitis. Nipple invagination is mainly congenital, but it can also be caused by trauma or surgery, breast tumor and fibroplasia after mastitis. Congenital nipple invagination is caused by poor development of smooth muscle of nipple and areola. These muscle fibers are pulled inward, and the lack of supporting tissue under the nipple forms nipple invagination. Generally, both sides occur at the same time, but also unilateral onset. The invaginated nipple can come back after being slightly squeezed or pulled, which belongs to mild nipple invagination. Congenital nipple inversion is more common in women who have no history of breastfeeding. Secondary nipple invagination is common in breast diseases, such as breast cancer, often unilateral invagination. Don't underestimate acquired nipple invagination. You should go to a professional hospital for relevant examinations, such as B-ultrasound and X-ray mammography, to rule out the possibility of breast cancer. There is another situation: eczema and itching around the nipple appear repeatedly and last for a long time. We should consider the possibility of paget's disease, which is a special type of breast cancer. If in doubt, please consult immediately. Let's talk about why nipple invagination should be corrected. Mianyang plastic surgery hospital chest plastic surgery experts pointed out that, first of all, from the functional considerations. If nipple invagination is not corrected properly, it will be abnormal to have children after marriage. Secondly, long-term nipple invagination will induce many diseases, and often inflammatory stimulation will cause malignant transformation; The third is to solve morphological problems. From an aesthetic point of view, the nipple must be at the highest point and the most central position of the breast.