<s>[INST] Back in January I got a lump under my armpit, I STILL have it, and now red bumps have formed under my arm. I went to the health department and I got a blood test for cancer. I was fine. But now I m having pain in my shoulder and back (left hand side). It s getting worse and worse and almost constant.. I don t want to go to the e.r. if it s nothing, definitely can t afford the bill, and the blondes at the health department are. Quacks -.- any ideas on what it could be? [/INST] Hi, dairy have gone through your question. I can understand your concern. You may have enlarged axillary lymph node. It can be due to reactive hyperplasia, tuberculosis or lymphoma.  You should go for fine needle aspiration cytology or biopsy of that lump. It will give you exact diagnosis. Then you should take treatment according to diagnosis. 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. </s>