Does this character eat a lot of ingredients? Ingest moon sugar? Drink skooma like there's no tomorrow? Was one of his parents a draugr? Well, my friend, you have an addiction or you're half undead, and this is the outward manifestation. Or... your game is bugged on this guy.

Nah, addiction, it's more fun that way.

I heard that the Aura Whisper shout makes your eyes glow blue like a draugr.