Hi our almost 3 year old Gael, had a fall on the floor, hit his head and had a huge bump in the back of his head, we monitored it for any serious signs for a concusion..Eyes were fine, no vomiting etc., he had a runny nose at the time already, his general behavior was fine, we put some ice and lots of arnica and now a week after has a mild fever . He started school this same week also ( so you know) it could be from a schoolmate as well.. Any thoughts? Thanks AAAA