My two new hens came with bald spots on their backs. I introdued them to my flock this week and the bald spots got a little bigger. Today I saw my BAndie hen pecking on the back of one of the new girls, in the bald spot. None of my flock have done this to each other until now. Can I stop it? Can the backs of the new girls be protected? It's not really practical for me to keep them seperate on a long term basis. TIA.