White areas on male comb/face?

[PakehaPoultry]

We are new to raising pheasants, and noticed a male bird who's comb (on the face) is becoming white. It was all red like normal, but in the last couple of weeks we noticed a small area had become white, and I now see it "spreading". The bird otherwise appears and acts normal, but does anyone have some clues as to what this is? We want to treat it properly if it's some kind of infection (we have him isolated).

Thanks in advance for your help