My chickens have mites so this morning I applied ivermectin pour on. While doing this, I was able to inspect my birds. I noticed that a few of them have raw vents, especially my cochin rooster. His vent was very bloody and had hard yellow areas around it. He must be in a ton of pain and I can't imagine him having to relieve himself with a vent like this. I can take pictures, but it's fairly gruesome. They have bloody scabs on their bodies from the mites. Did the mites also cause their vents to become raw? Is there anything I should be doing to help his vent heal? Maybe some antibiotic ointment? Any help would be much appreciated!