Today found my silkie roo with dried blood on the top of his head, we have 2 silkie hens and 2 polish hens and 1 silkie too. They all seem to get along well so not sure what happened to him! Have hard ware wire buried 2ftdown and 2 ft out all the way around my chickens coop and run and the entire coop is hardware wire so I don't think anything can get in? I brought him inside to clean him up,there were a few patches of dried blood and dirt that I took off his head and feathers (kind of looked like a scab but it wasn't). Then little spots started moving!!! Some of it was dried blood and dirt but I think there mites!!!! He seems to have what looks like a hollow feather still sticking up about 1/4 of an inch and a little bald spot, its not bleeding and I cleaned it with witch hazel ( its all I had) and put Vaseline on it, went to tsc and got some permethrin and dusted all of my chickens. So worried that stuff could hurt them! I couldn't find bugs on the other chickens, kind of hard since they have black skin. My black and white polish had a couple of spots where there was blood on her feathers on her chest . She's a super fast chicken and the roo tries to mate with her but she jumps and runs. Wondered if she could have hurt the roo? Really concerned as to how he got hurt and want to make sure it doesn't happen again! I use de in the coop and in my run but not sure if I'm using enough( no instructions on the container). I live in Michigan and I can't wash the coop it's 25-30 degrees outside! I plan to clean the coop and run this weekend. Not really sure what to do! Any help would be greatly appreciated! Forgot to mention lady week I caught 2 mice in a trap in my chickens coop during the night, I read that mites live on mice and wondered if that's where they came from?