Hi, Small golf ball sized swelling on right side of jaw should be taken as serious unless proved otherwise. The commonest causes are as follows: - Submandibular salivary gland - Lymph node - Any sort of a cyst If the swelling increases on eating anything then it is most probably salivary gland swelling. The commonest reason is a stone in the duct. Ultrasound and still better the CT scan of the affected area gives best idea, relevant tests of blood, FNAC if this is lymph node to know the probable cause. All these will lead to a specific treatment and thus gives a plan for specific treatment. Stone needs surgery. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. T. Chandrakant, General Surgeon