I have 1cm lymph node behind ear. movable painless. been there 3 months. don't think its grown.if it was lymphoma would it have grown by now? how big?

Biopsy.: An enlarged lymph node can be normal, or it can be a due to cancer. Lymph nodes that enlarge due to an infection (normal) are usually sore. A 1cm lymph node is just on the edge of being too big. The only way to know if it's normal is to ultrasound and/or biopsy it. Lymphomas cause rubbery lymph nodes that often grow, but not always. The lymph node behind your ear is associated with your scalp.