Through the winter my hens were starting to get bald spots on their butts. I thought at first that they were just molting, but from what I have read about molting they start at the head and goes down the body, and this does not fit with that. However, until recently i had dismissed it as molting. I have noticed that one of my hens is perfectly fully feathered, only one. I just introduced new 10 week old pullets to my flock and witnessed the fully feathered chicken bullying my pullets and then came out later and one pullet was very badly injured and bleeding on her butt above her tail feathers. I am wondering if she could be responsible for all of the missing feathers on my hens and if i should cull her from my flock? Please help!