Broken hand/tail or sick (fungus)?

[PearlTooth]

Https://imgur.com/30CaLip

Hello, this little guy cant move this arm and had some white stuff on his tail and I am not sure if this is some kind of fungus or a broken arm, I already gave him a 15 min tea bath. Should I remove him from the aquarium and keep him in a container or is he fine?

Thank you

 

[KumquatSquats]

do you have other axolotls? that looks to me like a bite or nasty scrape, the area around it would be the slime coat peeling. im not sure how to tell if its broken but id say its probably a good idea to isolate him until you can figure that out to prevent further injury