Hi Janet,If I were you I wouldn't wait,but go to your doctor and have it checked out.A lump in the arm pit could be a swollen lymph node that might suggest an infection or something else.Why live with the doubt? Any lump in the body should promptly be examined by a trusted doctor.Believe me you are not over reacting by being worried about this lump.It's your body and you deserve to have peace of mind, especially that you mention that it's not going away.I hope that you'll see your doctor soon.Wishing you the best.
I forgot to add this. I was detected with tuberculosis about 6yrs ago and finished my treatment successfully. It was after that that I had this lump in my right armpit. From the past 10 days, my right nipple seems to pain if I press it slightly. This is not the case with my left one. Looking for advice!