<s>[INST] I have a lump, on the right side of my spine at base of skull. It is not painfull and it does cause alot of headaches, today i found lump on the left side again this is not painfull. I went to the doctors and they have booked me in for a ultrasound but i now have to wait over a month to get these done do u have any ideas what these could be?? [/INST] Hi, dairy have gone through your question. I can understand your concern.  You may have some enlarged posterior cervical lymph node, skin adnexal tumor or soft tissue tumor like lipoma, neurofibroma or dermatofibroma. 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>