I have a female rat, under 1 year old. She has what looks like to be scabs and small sores as well as thinning hair. when I first noticed I pulled her and put her into her own tub. Last night she went on a rampage killing rat pups. There was no overcrowding just her and her litter. This was about her 4th litter.

I also have another rat that came from the same litter, looks almost identical to her with no issues.

I tried to take pics but I couldn't get any that showed the skin clearly.

Richard