Apple muscle is not a medical term in the true sense. It is a fatty tissue located in front of the cheekbone, two centimeters below the eyes, in the shape of an inverted triangle. When smiling or making expressions, it will slightly bulge due to the squeezing of the facial muscles, looking like a round and shiny apple, hence the name apple muscle. As we age, the apple muscle will gradually shrink, making people look old. Through plastic surgery fillers, the apple muscle can be restored to fullness and make people look young and beautiful. The main methods of filling the apple muscle are autologous fat transplantation and hyaluronic acid filling. If the candidate chooses an irregular institution or the operator lacks experience, it can lead to the following adverse reactions: 1. local unevenness after filling and bilateral asymmetry of the apple muscle; 2. in the process of filling, the subcutaneous blood vessels are destroyed, resulting in fat particles entering the blood, and with the blood circulation bad into the lungs, brain and other organs, fat embolism can be formed; 3. if the facial expression muscles are damaged, it can lead to facial muscle stiffness or expression 4. Excessive filling can lead to local skin ischemia and necrosis, or bruising and bruising in the short term. Therefore, when beauty seekers need apple muscle filler, they should choose a regular hospital and seek the help of professional doctors.