Question concerning healing of nerves in surgery incision

I am 3 months post-op, and have started getting sharp shooting pains that are going the length of my incision. I am not totally freaked out, as I know the nerves in the scalp can take a long time to heal, but is it normal to have the shooting pain start 3 months after surgery? Unlike my first surgery the pain is not hitting often, but unlike my first surgery the pain started much later.