I have a polish hen who has lost some feathers around her eye only. There seems to be no discharge and she is opening it but her top feathers do seem droopy on that side only. I can't tell if anything is swollen but her eye lid seems to be okay. She's feeling well and still eating good. I did take pics and notice something crusty in her feathers. There also seems to be small patches on the skin where it's white, pointed out by the arrows. Any ideas what this is and how I should treat it?