A soybean-sized cyst at the root of the tongue may be a mucous cyst, which is treated by surgical excision, injection of tincture of iodine or sodium chloride into the cystic cavity, etc. The details are as follows. 1. Surgical excision: the most commonly used treatment method, under local anesthesia to excise the cyst as a whole, if the cyst has repeated episodes, has been adhered to the surrounding tissues, need to excise the surrounding tissues together. 2. Injection of tincture of iodine or sodium chloride into the cystic cavity: after pumping out the cystic fluid, injecting 2% tincture of iodine or 20% sodium chloride into the cystic cavity, and then pumping out the drug after 2~3 minutes can destroy the epithelial cells and make them lose secretion function, so that they can’t form cysts again. It is recommended to go to regular medical institutions to receive professional treatment, and the above drugs should not be used without authorization.