He's probably just staying like that righ now because that's how he actually looks.
When he has the tanned skin, it's just a disguise and not his actual form.
Now that Tristan knows about it, he doesn't need to hide it anymore Infront of him.
Oh that makes sense I can't really remember what happened before so I thought something was wrong
Turns I was wrong....I forgot that Ethan was drugged in the previous chapters before the last season ended. It messed him up a little.
Why hasn't Ethan changed back???