Today while we my DH and I were cleaning out our coop, my chickens were going to town on our sunflowers, and having a great time eating the seeds. I just happen to look over and see Alpha Roo's back side as he bent over to get some seeds. That's when I noticed that below his vent was a large patch of red. So once they were all in the coop half asleep we snuck in and checked out his vent. The vent looks fine, but under it all the skin is inflamed. It looks like a patch of red blisters. I looked for mites, but can't see any evidence. He's been acting just like the Alpha he is, and I can't find any information about this on line. Does anyone have any ideas on what could be going on? Or even where I should start to get this solved? I have 26 other chickens and haven't noticed anything with the others. Thanks in Advance.