bet you have a feather plucker, can be hard to see them in action at first, butt(he he) once they create a blad spot they all go after it, it looks different. I have a hen whos butt has been bald for a year, as soon as new growth starts they are plucked out, tried all the goos, lotions, sprays, ect.. don't work putting pinless peepers on this fall so she can be feathered for the winter. good luck