Could be lymphoma,go and see a lymphoma symptoms website.Good luck
your skull
Please sign up for this study regarding this problem: http://www.clinicaltrials.gov/ct2/show/NCT00757315?recr=open&cond=%22Keloid%22&rank=5
you need to see a doctor about that one. sorry!! something is wrong.
If the lump/bony bump is indeed a permanent fixture near the base of the skull, it's most likely the classic "External Occipital Protuberance". If, however, this is a new growth on the skull, or if...
Go see your family doctor, to make sure it is not a serious problem.