Got a concussion 4 days ago. now i'm getting pain in small, isolated spots in my head. is this normal? should i be worried?

Monitor closely: The pains at the site of head trauma may be due to mechanical injury to the skull and scalp tissue damage. If your symptoms don't resolve, get worse, or if you have any new neurological deficits, then see your physician immediately. http://www.brainline.org/content/2008/12/headaches-after-head-injuries-8212-post-traumatic-headaches.html