Okay, my cat Lucifer hurt the pad on his dew-claw. It swelled a bit, then it went down for a while, then it suddenly swelled up again!
We took him to the vet, and he said Luce is running a slight temperature and that his toe is really badly infected.
He gave us a course of antibiotics to treat the antibiotics to stop the infection, but he said that if it's still bad after the course is finished, that the bones could be infected, and his toe might need to be amputated!
I'm keeping my fingers crossed that the tablets will sort everything, I don't want Luce to go through surgery.