What can Geralt do against "You look terrible" / "You look pale"?
When Geralt talks to people, they say randomly: "You look terrible!" or "You look pale!"
Are this hints that he should take a nap? Or eat something special?
(I'm sure that Geralt is not poisened at this time.)
Nope. He just looks that way. Kinda like all the casual "freaks" and "mutants" that get tossed your way, nothing you can do about it.