Injured frog with lumps all over, need help!

[Jessalyn]

Update:
I came home today and after only one day of Neosporin the bubble on his back is half the size it was yesterday. I'm hoping that's a good sign! I'm going to fix him up an unflavored pedialyte bath and see if he perks up since he's still pretty lethargic. Poor thing still won't eat, but he did poo as well which is good because I'm not too sure what's going on with his back end.

Here's a picture of the bubble and back end





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