Hi,
Welcome to the ehealthforum and I am really glad to help you out. Your concern is regarding the swollen lymph nodes on the neck and jaw.
Lymphadenopathy (swollen lymph nodes) is usually caused by a viral or bacterial infection along with other numerous causes. Other causes include allergic reactions, arthritis, cancer, metabolic diseases, and an overactive thyroid (hyperthyroidism).
What exactly is this can be diagnosed only after examination and investigations like ultrasound or CT of the area and a fine needle aspiration cytology(FNAB) of the lymph node. This will reveal the cause of lymph node swelling also. You should get it done from your doctor.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care.