My son was running outside with his cousins when he slipped and fell on cobbelstones resulting in injury to his forehead, the top of his nose and his knee. He had a nose bleed, a big lump on his forehead and a scraped up knee. At first he was in pain and pretty quiet, just laying around. After an hour or so, he snapped back pretty quickly and was his normal self again. Now, 4 hours later he started running a high fever. Since we are out of town, I have searched the internet and find conflicting information if the fever is related to his concussion . Can I continue to closely monitor him, or do I need to take him to the E.R. immediately?