Hu Xiaogen, Department of Plastic Surgery, China-Japan Friendship Hospital, Ministry of Health: Hello, according to your situation, we should first make clear the position of masseter muscle and whether it is hypertrophy. Masseter muscle is a muscle located in the lateral zygomatic arch and mandibular angle, which is obliquely distributed outward from top to bottom. Some people are congenital masseter hypertrophy, and the masseter muscle will be hypertrophy because of repeated exercise in people who often chew, which is like the developed muscles of bodybuilders. Botulinum toxin is a neuromuscular blocking agent, which paralyzes some muscles for a period of time. Due to muscle paralysis, the exercise strength is weakened, and at the same time, the nutrition of muscles is reduced, resulting in the gradual atrophy of muscles and the gradual reduction of appearance, which is to achieve the face-lifting effect that people want. There are important nerves, blood vessels and other tissues in the masseter muscle. Drugs can cause complications such as facial paralysis. Although allergies are rare, they cannot be completely ruled out. Therefore, it is best to go to the beauty and plastic surgery department of a regular and qualified medical institution and choose a qualified doctor for treatment to reduce the risk. Doctor Hu