We have 8 Australorp hens. We had mites bad- we are pretty sure we have successfully gotten rid of them. After a lot of reading we used ivomec on them and built a new coop. I now have 2 hens that have bloody wing joints.. the other hens are picking at them and they themselves may be over grooming.. We put them on antibiotic and will stop that on Friday. We sprayed with a antiseptic and tried to cover with Vaseline. The Vaseline didn't stay.. I would really like to keep my hens alive. They also have messed up feathers, I am assuming from mites but have also read that they could be in a 22 month old molt. Any ideas would be helpful.