Just to fill in a bit more detail on his condition, not only has Theon's hair gone white and his skin become like an old man's, but he's also a few digits lighter:
[quote]Thusfar he had lost only two fingers off his left hand and the pinky off his right, but only the little toe off his right foot against three from his left. Sometimes Ramsay would make japes about balancing him out.[/quote]
He's also had some of his teeth broken.