Given the data you provided (small bump on the neck right under the jaw line) it is possible that it might be an enlarged lymph node. An enlarged lymph node is usually a sign of inflammation in certain of the tissues or organs in the vicinity.


The lymph nodes in the neck might be affected when there is an inflammation in the throat or the tonsils. Inflammation affecting the skin on the face might also cause enlarged lymph nodes in the neck. Depending on the exact location of the bump you might be touching the submandibular gland which is one of the three pairs of salivary glands. It also might be inflamed.


The inflammation in the throat and the tonsils might be caused by a bacterial or viral infection.


You might want to visit your family doctor for a physical examination and laboratory blood tests. If infection is detected, you might be given antibiotics.