<s>[INST] Tender forehead by hairline and walnut size bulge, it is tender off and on for the last year, as if I was hit in the head! I am a 64 yr old female, and do computer work. Also frequently have a ringing in ear on same side. I had a PET scan 2yrs ago, it showed nothing abnormal. [/INST] Hello, Since the tenderness is there for a year or so, it is not a serious condition that is causing that. Probably a lymph node or a local hair follicle infection may cause it. See a Dermatologist in order to get a correct understanding of the problem. Hope I have answered your query. Let me know if I can assist you further. Take care Regards, Dr. Erion Spaho, Neurologist, Surgical </s>