Mucous cysts can occur in all oral mucosal areas except for the dorsum of the tongue and gums, but they are more likely to occur in the buccal mucosa, floor of the mouth, sublingual and soft palate areas. Mucous cysts in the oral cavity are mainly treated surgically, and the cyst and the mucus glands forming the cysts need to be removed to prevent recurrence. The occurrence of mucus cysts may be related to bad habits, such as repeated lip biting, tongue biting, etc. Such repeated biting may lead to damage to the mucus gland duct opening site, which may form scarring and lead to the mucus gland opening not being open and then forming cysts, so the best way to prevent recurrence is to correct the bad habits.