A clear blister under the tongue is commonly associated with a sublingual or anterior lingual cyst. The specific location: sublingual cysts are usually located at the mucosa of the floor of the mouth under the tongue; anterior lingual cysts are usually close to the tip of the tongue. It is recommended to visit the oral and maxillofacial surgery department of the hospital for a detailed examination of the specific situation. If it is a sublingual gland cyst, inpatient surgery is required. Surgical removal of the cyst and the sublingual gland gland is needed to avoid recurrent attacks after surgery. If it is a prelingual gland cyst, it also requires surgical treatment, which usually does not require hospitalization, and can be done at the oral and maxillofacial surgery clinic of the hospital, which also requires surgical removal of the cyst and the prelingual gland gland to avoid recurrent attacks after surgery. If the gland is not removed cleanly, it is easy to cause the prelingual gland cyst again.