<s>[INST] Hi, what could this be?,, I m 24yo female with a hard lump on my neck above the collar bone, I noticed this almost 2 years ago and had scans etc done, had a needle biopsy which showed up inconclusive so was operated to remove it, ended with the consultant puzzled by it but they weren t concerned, it came straight back after the surgery, now recently I ve noticed another ( possibly feels like it s attached to the original one ) I m also waking up most nights with coughing fits, having bad headaches and back pain..... [/INST] Hi, dairy have gone through your question. I can understand your concern. You may have some enlarged lymph node or other mass.  Enlarged lymph node can be due to reactive hyperplasia, tuberculosis, lymphoma or metastatic carcinoma.  You should go for biopsy of that lump. If needed go for immunohistochemistry study.  It will give you exact diagnosis. Then you should 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. </s>