Posting for traffic.
5yo DS was smacked in the mouth today by a child at school with a toy car. As a result he's cut the inside of his lip on a tooth. He's been swollen but fine. Until tonight - he's woken up with a fever, complaining of pain, it's hard to see the cut as it's on the inside at the top but it's very swollen and a bit yellow looking.
Could this be an infection??