At the risk of hearing "I told you so" I purchased some new pullets from a couple of backyard growers 2 weeks ago and bought a problem. I wasn't dilligent enough, and one of them snuck a sick hen into my cage when I wasn't looking. I bought 20 laying hens from two different sellers, so I'm not sure where she came from but as soon as we got home, I noticed that I had one hen that was missing some tail feathers. The skin looked red and irritated and there were some white flaky things around her butt. I haven't seen anybody picking on her. She is a 3-4 month old pullet. I've isolated these new birds from my current flock, and have been watching her. There doesn't appear to be any more white specks around her tail, and the skin isn't as red but she has a lot of broken feathers. Can anyone tell me what is going on with her? Is this something I should treat? Does she need to be isolated? As far as I can tell, she is the only one of this new flock that is affected. Everyone else is doing fine.