Already 20 years old puberty development is over, the nipple is still not exposed, considered to be the symptoms of nipple inversion, due to the smooth muscle around the nipple dysplasia caused by the nipple to pull inward, the nipple can not be exposed. As the nipple is inverted for a long time, it is easy to form inflammation in the nipple and breast ducts locally, and it is very easy to repeat the cycle for a long time, and the nipple inversion affects normal breastfeeding in the future, so it is necessary to go to the hospital in time for consultation. The first choice is to use manual pulling or suction treatment, often pulling the nipple or using negative pressure suction can make the nipple protrudes, the breast ducts and the fiber muscle lengthening so that the nipple naturally convex, to achieve the purpose of natural treatment. If the physical correction method still can not solve the problem, you can choose surgical treatment, surgery using stent support to correct inverted nipple, no matter which method is used, it is recommended to go to a regular hospital, so that the doctor can check, and then guide the corrective treatment.