it's not.. pretty sure that's a typo. At least i hope so lol.
Honestly, the little guy looks pretty good to me. I don't see any color fading. Are you talking about those white spots on the top of his head? Not sure what that could be.. but i'm pretty sure it isn't normal. But it also could just be tissue damage from past fights with other fish or if some trauma happened to the fish.
Hopefully someone else can chime in.