Hi guys - all my hens are 33 weeks old, they're all laying, and a few weeks ago most of them (not all) got fluffy butt - where their backs meet their tails the feathers got all fluffy/downy looking. I chalked it up to molting, based on some research. Today we noticed that one of them seems to have picked out a feather or two (or someone did it to her) and where one feather's been pulled out things are looking a little painful - mildly inflamed, and a bit scabby. So now I'm thinking maybe it's something else, but I can't seem to find a definitive answer by researching online. Also - is there any way I can treat the inflamed area without doing more harm than good? Any/all advice is welcome. These are my first chickens...