I was out of town for a few days the other week and when I came back I noticed that my usually top of the pecking order hen was acting weird. She normally comes over to me for treats and to be pet but instead she was running away and would'nt eat. I thought it had something to do with her molting. But today I noticed bloody scabs all over her comb, wattles and ear lobes. She also has identical cut marks on her legs. Like the scales came off of them. As far as I can tell she is the only chicken I have with any of these symptoms. Any ideas what this is? Thanks in advance for any help.

. It seems to start off as white blisters than become these enlarged bloody scabs. Is this from scratching at them possibly? I'm going to give the whole flock antibiotics, a vitamin/electrolyte/probiotic supplement and try to keep iodine and vaseline on their combs. But I probably won't be able to do every chicken's comb every day. I have read about putting iodine in the water to keep it from spreading. Is it safe and how does it work? Is their anything else I can do like garlic or ACV or something? I just want to make sure that I'm doing everything possible to get them healthy again. What is the best disinfectant for my coop? Is just white vinegar strong enough? Here's a picture of what it looks like starting out on one of my hens...