Chrystal has been like this now for months! We have treated her for bugs (seven dust) and we've scrubbed the cage and treated it but she free ranges during the day. I've watched to see if any other chickens are bugging her but she's actually "miss attitude" and if anyone is being mean, it's gonna be her. She has one friend that she hangs w/ all day and that hen is perfectly fine. She is the only one we have that is doing this. Not only is her neck bald all round but a small area of her chest is like this too. I have no clue what's causing it and not sure what to do???