My chickens are always pecking each other. So half of my chickens don't have feathers on there backs. It got worse a few weeks ago one of my chickens died from a porlasp (not sure if I spelled that right) anyway I went out to feed them and one of my hens backs have green puss coming out. it is nasty. I don't know what to do. she acts fine it just really gross looking. Please someone tell me what I should be doing about this because I am pretty sure this isn't something I just let go. Thanks in advace