It sounds like you are developing a foreign body reaction to part of the pencil left behind from the stab wound. The frontal bone behind the brow is rather deep...almost 1/2 inch deep (6-8mm). The cyst or bump may be left in place unless it becomes infected or inflamed, in which case it would need to be surgically opened and removed.
Sincerely,
Timothy D. McGarity, M.D.
www.tmcgaritymd.com
Thank you very much Dr I had a CT Scan done and waiting on the results but this doesn't sinus like anything cancerous to you? Thanks again but a little nervous waiting on results.