If the nipples are still flat and relatively small after the end of puberty development, consider the nipple dysplasia, promptly go to the hospital for detailed examination of the specific situation and discharge the low level of hormones in the body, resulting in nipple dysplasia, which requires symptomatic treatment. If the nipple development is normal and relatively flat, consider the breast ducts, muscles and tendon tissues around the nipple to be dysplastic, you can choose to lift and pull to promote nipple protrusion, and use negative pressure to attract and pull the nipple, which needs to be adhered to for a long time and has a better effect. If there is no significant improvement through physical correction methods, through surgical treatment, you need to go to the regular hospital mammography department, nipple dysplasia invagination, will affect the later breastfeeding, and even lead to other diseases, need to correct the treatment as soon as possible.