itching

I just rescued two male rats. One has some scabs on his neck and a few on his upper body. My first thought was mites but I don't see any when I look through his fur. The other boy seems to scratch his face and lick his toes quite a bit but I'm not sure if its grooming or something else. I know...

When these symptoms first began I took my rat Rosie to the vet, they said it was most likely mites so both my rats have now been treated for mites and I've cleaned everything thoroughly. Rosie was also on antibiotics for her sores, but she just started to get worse so I took her back a few...