The swollen biting muscle after taking face thinning injection may be a normal phenomenon, or it may be related to the frog cheek deformity factor. 1. Normal phenomenon: patients may have swollen biting muscle after taking face thinning injection, usually due to local hematoma factors, which is a common performance, you can use ice compresses to promote the subsidence of local hematoma, which can improve the symptoms of patients. 2. Frog cheek deformity: some patients have swelling on the side of the lower jaw after taking facial thinning injections, which cannot be excluded due to the complications of botulinum toxin, such as frog cheek deformity. Such cases are related to the range of botulinum toxin dispersion, and it is recommended to go to the original injection organization for a second injection to adjust the appearance. It is recommended that patients who experience swelling of the biting muscle after face thinning injection may also be related to other factors, and it is recommended to go to the regular hospital in time, and need to cooperate with the specialist to improve the examination and determine the cause before processing and treatment.