My rooster's comb got blackened tips and the back of the comb just above the feathers became a target for the hens. I cleaned the wound up and put a triple antibiotic ointment on it then separated him for a couple of weeks. It looked pretty good except for a dark scab so I put blue kote on it thinking that would hide it, but the gals found it and picked it right off. Since then I've kept him separated, gave the girls some cat food kibble, but stopped when they could range. When I let him range with them, it was OK for a day or so and then it started again. I think it's just a couple of hens. I have 14. I've tried pine tar too, but that didn't faze them. I also have a White Crested Polish rooster who has been inside because they pulled his crown feathers out and pecked his head bloody. He was my "free exotic chick". He ranges with one hen now that the weather is a bit better and she is fine with him.
All of the information from the forum has been great, but I'm still stumped. Oh, I'm feeding organic layer 16% plus some greens.