The size of both breasts is basically similar, but we cannot rule out the possibility of bilateral size discrepancies due to various problems during the development process. If a boy’s one breast is significantly larger than the other, it is recommended to have an examination such as an ultrasound. If the breasts are significantly larger consider two reasons: 1, whether it is because of obesity causes too much fat in the breast chest, the problem is relatively simple, you can exercise to lose weight to relieve the symptoms. 2, may be male breast development, the performance is breast enlargement but more on both sides, do ultrasound are able to clearly diagnose. The effect of drugs and exercise is recommended to do surgical removal, the risk of surgery is not large, the operation under local anesthesia is relatively simple, the effect is also more obvious.