Breast collagen injections generally do not have side effects occur, some people may have hard nodules, allergic reactions, swelling and other symptoms. Collagen belongs to a kind of reliable filler, after breast injection of collagen, it can make the local skin become more elastic, and can also achieve the effect of breast augmentation, but also more effective in locking the water, so that the breasts are more beautiful and full, it can improve the symptoms of sagging and flat breasts, and also adjust the breast shape, generally will not have side effects on the body. Try not to get wet for 1~3 days after the injection, eat a light diet, avoid excessive spicy and stimulating food, and do not rub the injection site to prevent collagen transfer. It is recommended to choose a regular hospital, under the guidance of the doctor to choose the dose suitable for you.