Sprained Paw?

Last night I noticed that Marshmallow won’t put any weight on his right front paw and he holds it up with his fingers curled in. It looks like it could be just slightly swollen, but other than that there’s no obvious injury. He still uses the paw to clean himself and hold food, but won’t walk on it. He also doesn’t squeak or anything when I touch it, so I’m not sure what’s wrong. He was fine on Wednesday when I let him run around, so my guess is he either sprained it jumping down from his spacepod (which I’ve since flipped over so it’s free-standing on the ground) or he was bitten by a bug. I’ll be keeping a close eye on it so that if it gets worse I can take him a vet. If it’s just sprain it should heal on it’s own. Poor Marshmallow.