I have a rooster and 4 hens. One of my hens, a buff Orpington, I have noticed, is missing feathers on the back of her head and neck. It looks like she has scabs and some of her skin looks green? Obviously that can't be normal. Any suggestions as to how to help my poor girl? Or anyone know what is wrong? I feel as though the rooster is the culprit for her losing the feathers on the back of her head just not sure why her skin changed color.