In 90 percent of teenage boys, gynecomastia goes away in less than three years. Sometimes the problem can be solved if you stop taking a medicine that is causing gynecomastia or stop using an illegal drug that is causing the problem. Occasionally, medicines may be used to treat gynecomastia, especially if tenderness is a problem. The medicine will make the extra breast tissue go away. Rarely, surgery may be necessary to remove the extra breast tissue.
Treatment is necessary if gynecomastia is caused by a disease or a tumor.
If it is due to a disease, the disease itself will need to be treated. Breast cancer is very rare in males. Your doctor will probably be able to tell whether the lump is cancer. Lumps caused by cancer are usually not underneath the nipple, but breast tissue from gynecomastia grows in this area. Breast cancer feels different than the breast tissue of gynecomastia.