I have a young Rhode Island red rooster. He has a VERY red butt underneath his tail feathers. (around his vent) I have been treating my flock for lice/mites. The vet gave me atroban. I tried diatomaceous earth but was taking too long to work. I have cleaned the house thoroughly, started using cedar shavings, spread DE everywhere, including on the chickens. Everything is is definitely much better. But the rooster with the flaming red butt???? Is that normal??