The treatment methods for male nipple invagination are as follows: 1. The key time to correct nipple invagination is during the adolescent development stage, when the nipple can be pulled regularly, and long-term pulling can make the nipple protrude outward, but it needs to be done three to four times a day, for more than half an hour each time, and it needs to last for more than three months before the effect is seen. 2. In summary, there are more ways to treat male nipple invagination, and it is recommended that you choose the right method for you according to your actual situation.