The lymph nodes under the left cheek have a lump pain may be the body inflammation caused by lymph node enlargement, common causes are influenza, mumps, tonsil suppurative inflammation, and so on. 1. Influenza is a common manifestation of viral infectious inflammation, there will be a low-grade fever, cough, runny nose may be, parotid lymph node swelling is a manifestation of its inflammation. The condition can be treated with antiviral medications, such as acyclovir, and the swollen lymph nodes will improve with treatment. It is recommended that this medication be used under the guidance of a medical professional. 2. Mumps is mainly characterized by swelling and pain in the cheeks, which are surrounded by lymphatic tissue. Once inflammation occurs in the parotid gland, it will cause swelling and pain in the surrounding lymphatic tissues, which requires prompt medical treatment. 3. Purulent inflammation of tonsils mainly manifests as fever, pharyngeal swelling and pain, difficulty in swallowing, etc., which can cause swelling and pain of the surrounding lymph nodes. The first thing you need to do is to take anti-inflammatory antibacterial drugs (ibuprofen, cephalosporins, etc.) to reduce the temperature and pain. Secondly, if the abscess is serious, the abscess needs to be incised and drained. The above drugs and operations need to be carried out under the guidance of specialized doctors. If the patient has the above situation, it is recommended to consult a doctor in a timely manner, through a professional doctor to carry out reasonable and standardized diagnosis and treatment. Note: There are also tonsil suppurative inflammation, mouth ulcers, dental inflammation, etc. Please list at least three reasons.