A lump of flesh growing inside the jaw without pain is usually caused by enlarged lymph nodes, sebaceous adenoma and other reasons, patients can usually be treated by medication and surgery and other ways. 1. Enlarged lymph nodes: a lump inside the jaw without pain is usually caused by enlarged submandibular lymph nodes, mainly due to bacterial or fungal infections, patients can take amoxicillin, levofloxacin and other drugs under the guidance of the doctor for treatment, allergy is prohibited. 2. Sebaceous adenoma: a lump of flesh inside the jaw without pain may also be due to sebaceous adenoma under the jaw, the patient can be under the guidance of the doctor for the removal of sebaceous adenoma surgery, pay attention to the periphery of the skin after surgery to clean, to avoid infection. A lump inside the jaw without pain usually may also be tissue hyperplasia, submandibular gland swelling and other causes, it is recommended that patients go to the hospital in time for examination, under the guidance of the doctor’s treatment.