This is one of my 3 week old LB's who was fine last night and I found her butt like this this morning. I can see that the feathers have been plucked but the bulging concerns me....is that swelling from the plucking or could it be something else? I've consulted my chicken health book and didn't find a lot, but did apply some vetricyn and separated her from the others. i have had no other problems with behavior. any advice or help is appreciated.