Hi,
I gotta say vet too.
The fact there was enough of a hopper mouse left to make a recognisable regurge 4 days later would make me worry there was something far amiss with his digestion.
Coupled with the black looking belly that would make me want to have him looked at to the point I would ignore the skin issue or just put it down to stress from whatever else is going on.
Has he been drinking and have you seen any sign of poop or pee?
I would contact the person you bought him from as well, partially to keep them in the loop, but also to find out if they have seen this before and double check they hadn't been treating for mites or any other possible causes so you can pass the info on to the vet.
I hope he is ok for you.
dr del








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