Ok..so I just went to check for eggs and one of my red sex links was on the nest. Ever since I got her, she was missing lots of feathers on her back but since we got her, the down was starting to grow back in I thought. Today, she has what looks like a gaping skin lesion on her back. It isn't bleeding, but I'm not sure what to do. Is there medicine I can put on this to keep flies away, and also to heal? I know we have a spray that we are putting on our calves who were castrated a few weeks ago....any suggestions??