Mucous cysts are usually due to mucus duct obstruction and mucus retention and can occur in the lip, cheek, and tongue mucosa, with the lower lip being more common. It presents as a painless, translucent blister about the size of a soybean located in the submucosa. Although there is no obvious cause, the disease is often caused by mild trauma that ruptures the mucous gland ducts and causes salivary mucin to spill into the submucosal tissue or lamina propria. It can also be seen in glandular labyrinthitis, which is due to hyperplasia of the mucosal glands and ducts of the lip. It manifests as a painless, translucent blister with mucus swelling located in the submucosa, about the size of a soybean. After rupture, the mucus can flow out and the swelling subsides, but it can recur soon. After multiple recurrences, the surface of the cyst is often grayish white due to scarring. Relief methods: Oral mucosal cyst treatment steps 1, semi-sitting or supine position, routine sterilization of oral mucosa, exposure of the surgical field, the operator holds an empty syringe equipped with a 9-gauge needle, stabbed from the mucosa around the cyst, through the base of the cyst deep into the cystic cavity, at this time from the surface of the needle tip can be seen in the cyst activity, aspirate the cystic fluid; 2, from the needle core to remove the syringe, leaving the needle. Replace the syringe with another syringe with saline, push saline into the cystic cavity according to the size of the cyst, and then aspirate all of it; 3. Remove the saline syringe from the core, leave the needle in place, replace it with a syringe with 0.5% iodine volt, slowly push iodine volt according to the size of the cystic cavity, fill the cystic cavity (restore the original size), remove the needle, and compress the cotton ball for a few moments.