Hi folks. We got four hens a month ago. If the vendor is trustworthy, they are all ISA Brown, in the range of 24 to 26 weeks old now. We noticed one of them pecking at something just above her tail, between the feathers, and upon inspection we found this: (Click the photo for a closer view.) It looks like some sort of polyp, perhaps 3 mm across, standing out perhaps 6 or 7 mm from the skin. I haven't poked at it to see how it feels, but I gather it's bothering her, or she wouldn't be pecking at it. Is this anything to worry about? Thanks.