I second that you may have a feather picker. We just downsized our flock of 5 to a flock of 3 over this issue. Three hens looked like this. The other two were pristine. I sat in their run for an hour and sure enough caught the culprits in action. It had escalated to broken skin, so removal...
Hi. I am new to backyard chickens (6 months in) and am learning the ropes. We currently have a 3 hen mixed backyard flock (Dominique, Buckeye, Wyandotte) but may expand eventually. I appreciate this forum and all the shared knowledge and experience.