I have a mixed breed flock of 23 hens and 1 roo in one of my coops. Many of the hens have bare butts that are red. I've used DE and poultry protector and cleaned the coop multiple times. now my Roo has a small patch around his vent missing feathers. His neck feathers look like they are loose and lifeless and he has a bare spot at the base of his tail about the size of a quarter, there looks to be a pimple that needs to be popped in the center of that spot. I'm getting very concerned for the flock. I have a smaller flock in another coop and they aren't having any issues at all. The affected flock are still laying eggs very well. Can I spray Blu Kote and hope that all will heal up or do I need to be looking in a direction that is not related to feather picking. I can't imagine that one of the hens would pick at the top of the base of the tail of my Roo. I'm really stuck and am nervous for the ladies. I've had chickens for several years and never had an issue like this. would appreciate any input.