<s>[INST] I have a medium to large size bump on the back of my head almost near my neck on both sides. I have not hurt myself in any way and i have had them for almost a month now. I am now also beginning to get knots in my neck and only had one but now another one has shown up. Some days they hurt very bad to like move my neck or lean my head back. Other days i dont notice them at all. Any ideas? [/INST] Welcome to Chat Doctor for your health concerns am Chat Doctor and I will be looking into your problem I have gone through your question and understood your problem and concerns. It appears to be lymph node enlargement of the occipital region and now lymph nodes of the neck as well. These group of lymph nodes Chat Doctor.  It appears to be some kind of infection is going in this region. Have you taken any empirical medication for it? If it does not respond to empirical antibiotics' therapy then it might be some other pathology. You need to see a general surgeon, who might carry out excision biopsy of the lymph nodes and send it to histopathology to get a definitive diagnosis. I hope my answer will help you. Do rate it if you like it. Regards </s>