Oh my. First look up skin irritation on rats. Then search remedies and treatments. Some vets might see the little guy. Call. There is a vet by Lake Sawyer you take wild animals you find to. Call them. It's right by the fish farm you take the road off of Kent Kangley head towards Black Diamond it's on rt going up the hill just past train tracks and fish farm if you get to Lake Sawyer Grocery Center on left uv gone to far
I am not sure. You best bet is to call. Sorry I could not be more help.
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