I noticed two days ago that my black Australorp is VERY swollen under her vent. I have been monitoring her, and today it is much worse and even has small scabs. I am not sure if she was messing with it, another hen was, or if it's from stretching, since it is swollen. She is very tender in that area, and when I touch it, she jumps. She is luckily one of my most friendly, so I am able to check on her easily, but I have no idea what it could be. Has anyone dealt with this or know something about it? I really don't want to lose her, she's such a wonderful hen.