The body aches after the water light injection may be caused by allergy, infection and other reasons. 1. Allergy: Hydrographic needle is hyaluronic acid as the main ingredient, hyaluronic acid is generally not allergic, but in the case of the body’s resistance is relatively poor may also produce hyaluronic acid allergy phenomenon, so that feel the body aches after hydrographic injection. 2. Infection: the needle will cause stimulation of the skin when injecting hydrafacial injection, if the disinfection is not proper or improper operation, it may cause local infection of the skin, when bacterial infection occurs, it may appear after the hydrafacial injection after the feeling of body pain. When the phenomenon of body pain after the injection, it is recommended to go to the hospital in time for further examination.