I have Easter Egger chickens and am relatively new to this adventure. Two of my chickens are missing feather near their tails. It seems there is also some irritation. I did see one picking at herself, the other not. And The one picking at herself has become a bit more aggressive. Could she be bothering the other one? I did spray them both with Blue Kote to try to keep others away from them. Any advice would be welcomed. Thanks so much! I am attaching 2 pictures of the non-aggressive girl.