Hi there. I have a grey chicken (unsure of breed and exact age as we adopted her). She is the boss of the flock. She picks her own back feathers. She has a bare spot on the top of her back. It has been there since we have had her (over 6 months). I have tried putting vicks as well as bag balm on it, but it doesn't seem to help. It is never to the point of bleeding and the other chickens don't bother her. Just not sure if this is a big deal or what to do. She was a decent layer before (probably about 3-4 eggs per week), but didn't lay for several months. She seems to have just started laying again (very sporatically). Should I be concerned? I think she is probably 2-3 years old. Thanks!