I know this is not gonna be the popular answer here however you are dealing with extensive damage on a VERY young animal and if I were you I would consider putting the animal down now to end it's suffering.
If you don't do that than you MUST take him to a vet that will likely prescribe anti-biotics to prevent infection but let's face it given the size of the animal the recovery chances are low.
The animal would take a long time to recover (if it did) and would not eat during that process and could likely end up starving to death given it's size if the rest doesn't kill it.
PS: Fuzzie mice are nit appropriate size food for BP, the right food was offered just not fed responsibly that's all.
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