My bantam hen had been pecked (I'm guessing pecked) on her comb quite badly. there is a lot of blood and she has some very deep cuts. She isn't a new chicken, they have all been with each other for a year now and i have never seen anything like this before. they are also being very nice in the day and I haven't seen any bullying. do I need to treat it with anything or will it just heel on its own? here are some pics;