Hello! I have a two year old Buff Orpington with a bare bum! She has been this way for at least a year. I'm new to this site so I thought I'd ask if anyone had any ideas. At the advice of my vet, I checked her and the other chickens for mites...no mites. I've never treated them for worms either, but also see no evidence that they may have them. I have three Rhode Island Reds and the one Buff Orpington. The Reds are just fine, but I sometimes wonder if the cubbies where they lay their eggs may be the problem. The Reds are much smaller than the Buff and I was concerned that her bottom may rub on the back wall of the cubby when she is in there to lay. I've tried putting a large deep bin on the floor of the coop for her to lay in, but she continues to use the cubby. She doesn't sleep there at night like the rest of the girls, she sleeps on the floor of the coop. She appears very healthy, but is just sort of a cheeky chicken with her exposed pink bum walking around the yard. Its not inflamed or red, but I'm concerned if it puts her at risk for any infection or anything. Thanks so much!