My poor sweet Roo has had what I think is fungus on his comb. 3 Roos had it & the other 2 cleared up within days, but this poor guy has had it several weeks now. What I have tried...oregano oil, garlic oil, every athlete foot cream they make, now clean with betadine then rub on the strongest miconazole cream I could find. I've also given him vitamin capsules orally like vitamin D, oregano & garlic. He seems to improve but never really gets better, then it gets worse, like a long cycle. Any ideas of how I could help my boy?