My three year old son flipped backwards off of his tricycle a few days ago. He seemed fine. I kept a close eye on him throughout the evening and night. He was very irritable and sleepy a few days later and we've noticed bruising on the top of his ears and behind them. He also has a swollen knot on the back of his head. There is also brusing along his spine and spots here and there on his back. I brought him to the dr and they did scans and xrays and said they just seen swelling along the outside of the skull. Could there be a possible concussion or fracture to the skull that they may have missed?? I just feel very uneasy.