My girls have been laying now for about a month. I noticed today that one of them has what looks like a "pasty butt". I checked it as much as she would allow and it does not cover her vent area. It's like some of the feathers have become matted with poop. Being new to the whole chicken thing, I'm in need of some advice. Should I try to clean off her rear end or leave it alone? She's laying eggs and there is no blood and she looks very healthy. Any suggestions?