I need help with sick chicken!
Featured Stories on BackYard Chickens
OK also have read corid works as well? And also Apple cider vinegar to help prevent spreading?
It looks more like vent pecking to me. I would clean up their vents with a warm soak and when dry, put on some Nustock cream or spray them with BluKote. It would be wise to pen them together to heal for a couple of days. Make sure that they have enough room, get outside to range daily, and and are getting a little extra protein in their diets. Put some probiotics in their water also. Here is some info on vent pecking: http://www.thepoultrysite.com/articles/830/cannibalism-by-poultry/