I have a young roo who I just notice was lethargic and with closer exam found its eye area swollen and that he was bothered by it, possibly itchy him. I also have been treating an older hen for what I am pretty sure is Favus on her neck. I noticed she was scratching her neck and found the crusty skin. I am treating both with miconazole cream. What Im wondering is does Favus start out as a swelling and progress to the crusty skin? Are these two members of my flock suffering from Favus? Is Favus contagious?