Charlos can lay on hands on himself, because it just seemed wrong to have a paladin (even a ghostly paladin) whose healing touch hurt himself.

Ok, so over time, he should be able to heal all non-disease damage to himself.

He even seems sick, actually; the taint of the castle has really been taking its toll on him.

Oh. Right. That makes a lot of sense; I hadn't considered that possibility. Ouch.