Whether the swelling is from a break, infection, or an illness like gout, the only way to help him is to get him to a vet. The sooner the better. We can't provide the help and information you need, unfortunately.
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Torey
Eugene, Oregon, USA
1.1.3 Saharan Uros (Joe, Arthur, Hitch, Lefty, and Skywalker)
3.0 Mali Uros (Spike, Turtle, and Tank)
1.1 Ornate Uros (Scuttlebutt and Shazzbot)
1.3 Collared Lizards (Ripcord, Thiamine, Riboflavin, and Niacin)
2.0 Green Anoles (Bowser and Sprocket)
1.1 Chubby Housecats (Roscolux and Jenny)