I have a 3 month old mille fleur duccle chick that has something wrong with his comb, but is otherwise acting as he normally does. What's wrong with his comb? I noticed it starting to slowly blacken the past couple days and I thought it was due to genes, but now I'm sure its some kind of disease. How do I treat it and do I have to quarantine him away from the others? The others don't have this issue.