Here is just an example of odd sicknesses that I've had here. It started with strep throat. I had it for about 4 days, then one morning I wake up to a black tongue and a mountain range of bumps on the back of my throat. This picture was taken after 3 days of having a black tongue. Before, my entire tongue was covered with warts and lesions. DISGUSTING! I'm still alive, though, so I can't complain.
The doctors never figured out what caused it. I didn't expect them to.