Two days ago I let my hens out of the coop and my 18mo. old Buff Orpington was missing most of the feathers around her comb/head area and had some blood, but not alot. I could not find an open wound. I treated it with ointment and noticed when I was helping her another hen would come and peck at her aggressively. I am trying to sort out if they have mites/lice, if she's being bullied or if they are molting. There are feathers from all hens around the run/coop in the last week, all are 18 mo. old. Then yesterday, when I was looking her over again and putting some green goo on her open skin, the same hen again pecked at her sides. I've been trying to watch and she is eating fine, walking fine, and seems OK otherwise but the one hen seems very aggressive towards her, as do a few of the others at random times. She also seems like today she may have been pecked on one of her wattles, as theres some crusted blood. What do I do about bullying? How do I tell if they all have mice/lice or are just molting?