I was browsing my fave site called oddee and I found this shocking disease. The Vampire Disease. Actually, I don't believe if this kind of desease exist unless he is a true vampire.
Anyway, according to what i have read: There are people out there who go to great lengths to avoid the sun. If they are caught in the sun, their skin will blister. Some of them have pain and blistering as soon as the sun touches their skin. But they're not actually vampires. They don't drink blood and sleep in coffins, but they do suffer from a rare disease that has vampire-like symptoms.
Whew! This is surely and odd disease!