The protruding flesh on both sides of the mouth may be the opening of the parotid duct, or the tip of the buccal fat pad, or it may be caused by an enlarged bite muscle. 1. The opening of the parotid duct: generally located in the oral cavity near the teeth of the upper jaw, manifested as two small piles of flesh, a normal physiological tissue, where the saliva secreted by the parotid gland through the opening of the duct, secreted into the oral cavity. 2. Buccal fat cushion tip: generally located in the oral cavity near the throat area, is a piece of fat tissue in the cheeks bulging up the formation of triangular buccal fat body, is also a normal physiological organization, in recent years the rise of the excision of the tip of the buccal fat cushion to improve the face, to achieve the effect of thinning the face. 3. Bite muscle hypertrophy: If you often chew gum, betel nut, etc., it may lead to overdevelopment of the bite muscle, which appears to be bulging, and you may feel that there is a bulging meat on both sides of your mouth. If there is only protruding meat on both sides of the mouth, and there are no other uncomfortable symptoms, it is generally a normal phenomenon, do not worry too much, if there is pain and other symptoms, you should consult a doctor in a timely manner, so as not to delay the condition.