Turn Into A WereWolf?

There are people who are werewolves. This is true. The myth actually got started many, many moons ago. I am trying to think of the disease, but it escapes me. I don't think it is Lupus (might be.) Anyways, people with this disease, grow hair all over their bodies at a crazy rate. If they let it grow out, they truly do look like a human werewolf.