If you have a lump on the underside of your cheek, consider the possibility of the following diseases: first, diseases that occur in the parotid gland, with benign tumors being the most common, commonly mixed tumors of the parotid gland. After the diagnosis, the lesion should be surgically removed in time, and after the operation, attention should be paid to local pressure bandages to avoid the occurrence of parotid fistula, and attention should be paid to the prevention of infection. Secondly, some patients are affected by enlarged lymph nodes in the neck, which may also appear as localized bumps or lumps. Inflammation can also lead to pain and fever, which can be treated by anti-infective treatment with broad-spectrum penicillin sodium administered intravenously. In some patients, the infection is secondary to an atopic infection, commonly tuberculosis, and the patient may also have symptoms such as hypothermia, which should be treated systematically with anti-tuberculosis therapy.