One of my just-about-ready-to-lay pullets has one leg that has swelled to double the thickness of the other. She's walking on it fine, acting perfectly normal, eating and drinking and pooping and all that. I'm not sure what to do for her -- should I confine her and put her on antibiotics? I couldn't see a wound when I was inspecting her from a foot away, but she's my skittish one who doesn't like to be held, so I wasn't able to flip her over to take a better look ... will do that first thing in the morning when I let them out of the coop (she has to go by me to get out!). The leg is not red at all and doesn't seem to bother her, it's just HUGE all of a sudden. Any guesses as to what this might be?