I have 11 hens and 1 rooster and I noticed on a couple of my hens there is a bare spot on their backs above their feathers. On one of them I noticed that is bare down to her skin, not bleeding but does not look very good. Is this possibly from the rooster trying to mate or is it from pecking from the other hens? I have not noticed any of them picking on either of these two girls but I am only out there with them for a few minutes a day when feeding, watering etc. Any info would be much appreciated!!! Thanks! Should i put anything on the bare spots? I have added a light bulb to my coop to increase the daylight by a few extra hours a day but I noticed this problem prior to that. Could the bulb have any effect on this?