A hard lump inside the right side of the jaw that can move may be caused by localized jaw lymph node enlargement, sebaceous cysts, and folliculitis. 1. localized mandibular lymph node swelling: there is a hard lump inside the right side of the jaw can move the most common cause of localized mandibular lymph node swelling, will be accompanied by obvious pain, and local swelling is obvious, most of the oral cavity, pharyngeal area of the inflammation caused by the mandibular lymph node enlargement, the patient can use penicillin and streptomycin and other antibiotics, to alleviate the symptoms. 2. Sebaceous cysts: there is a hard lump inside the right side of the jaw that can be moved may be caused by sebaceous cysts, which are sebaceous gland ducts blocked leading to infection, which is characterized by purulent hard nodules, there can be redness, swelling, heat and pain symptoms. Initially, it should be squeezed to discharge pus and blood, if the initial period can not be completely treated, it can develop into cystic pustules, which can be treated by puncture and drainage of pus or incision and removal of pus cavity. 3. Folliculitis: Folliculitis may cause a hard lump inside the right side of the jaw. When suffering from folliculitis, there will be hard knots, local skin redness and swelling, acute attack, pressure pain is obvious, after a long time into chronic folliculitis, patients can apply ichthyolite ointment, mupirocin ointment, etc. for treatment. There is a hard lump inside the right side of the jaw, the patient is recommended to go to the hospital in time for consultation, clear causes, according to the doctor’s guidance for standardized treatment.