<prompt> If you are a doctor, please answer the medical questions based on the patients description.Small pea sized lump on Mastoid Bone that is as hard as a bone and I cannot tell if it moves, if it does it isn t moving much. Little to no pain when I press on it, more pressure than anything. Should I feel alarmed? Is this something worth going into the doctors office for? Thanks!  <response>: Hi, dairy have gone through your question. I can understand your concern. You may have some enlarged lymph node due to reactive hyperplasia or mastitis. You should take a course of antibiotics. If it doesnt respond to treatment then biopsy diagnosis is advisable. Consult your doctor and take treatment accordingly. Hope I have answered your question, if you have doubt then I will be happy to answer. Thanks for using Chat Doctor. Wish you a very good health. 