Lymph node behind my ear might be swollen should I be concerned?

Well, do you have any flu or teeth problem which sometimes it affects to your lymph nodes as well. Once the flu or dental problem gone then it will disappear naturally. But if the lump getting bigger and soring, you should go to see doc for checking it up. It is better to prevent a unwanted illness happening upon you than it really came upon to you. You know lymphoma? It is kind hemotology cancer. pretty scarry. Be a man!!