My 2 yr old tripped at the softball fields & hit his upper jaw, on his left side, on a metal bleacher seat corner. It's got a bruise on it right at ear lobe level, maybe a little bit higher. He is complaining that it burns when he chews & tips his head to the other side as well. Is this something he should see a Dr foror should we wait it out a bit to see if it resolves on iit's own, as I'm sure it's sore?