What is a thin face needle cheek depression?

The main principle of thin face needle is to block nerve and muscle conduction, so that muscle contraction relaxation, so as to achieve the purpose of thin face, thin face needle is mainly aimed at masseter muscle. Domestic thin face needle should be more diffuse, if immediately lying down after injection, the drug will diffuse to the surrounding tissues, so it will lead to cheek depression, if the dose is too large, it will also lead to cheek depression.