A lump inside the side of the neck may be an enlarged lymph node. If there are some inflammatory diseases around, such as upper respiratory tract infection, chronic pharyngitis, etc., it will cause the lymph nodes in the neck to be stimulated, causing inflammatory reaction, resulting in localized swelling. You need to actively treat these inflammatory diseases, avoid staying up late, and eat a light diet. There may also be localized subcutaneous lipomas or sebaceous cysts, need to go to the hospital to improve the ultrasound examination, for preliminary determination, if necessary, need to carry out surgical resection, pathological examination, which is the gold standard for differential diagnosis.