I would definitely put neosporin or blu-kote on them and isolate them from the others. Maybe give the chickens more treats to keep them busy during the day. hang some greens or a bird seed treat in the coop so they will peck at that instead of eachother. And putting any kind of pepper on them is going to do absolutely nothing. Birds cannot taste the capsaicin; hottness of the peppers. i give mine habaneros as treats lol