If there is any red blood color on the chickens it needs to be covered to hide it. A ointment doesn't hide the wound. The color red is a flag and triggers the cannibalism in them. The behavior can start due to over crowding, low protein level of feed or boredom. You can get Blue-kote spray (a purple antiseptic used for wounds) at Tractor Supply or other similar type stores. Cover the area well and also spray feather around the area. Chickens don't like the taste of Blue-Kote but, it won't hurt them. There is also a product called Peck-no-more that works well. Try upping the protein in their diet to at least 18% Some Layer feeds are only 16% which it a little low, unless they are free ranging and getting bugs and worms too. Hope this helps.