I recently purchased 3 chickens over a month ago. One I was told was in molt. The worst part of her being around her vent. She had another spot on her front and another on the back of her kneck. The front areas are starting to fill in but the vent area is terrible and doesn't look like any feathers coming in. Now I am starting to notice one of the other hens looking a little out of sorts and just today I saw a bare spot below her vent. Is this feather picking? What can I do about it?