<s>[INST] Hi i have a bump on the center back of my neck about the top of my spine. It is hard red and painful. I can move it a little side to side but not up and down. Ive had it for about 3 days now and has stayed about the same size, maybe the size of a quarter. It first looked like a boil and had a white head until the next day there was no head at all. what might it be? [/INST] Hi, dairy have gone through your question. I can understand your concern. You may have some enlarged lymph node or benign cyst like sebaceous cyst, or it can be soft tissue tumor like lipoma.  You should go for fine needle aspiration cytology or biopsy of that lump. 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>