Be Prepared to see these monsters:
When a patient who recently visited South America enters the hospital with a lesion on his cheek, the doctor thinks he knows that the problem is... he's being eaten by a parasite from the inside-out.
This man is being attacked by a parasite called leishmania, a single-celled organism that burrows through the skin and enters the bloodstream, triggering the immune system. Once the immunity cells show up to attack, it infiltrates the cells and uses them to breed more of itself, causing huge, disgusting sores to form in the infected area.
The only way to beat them back and restore the skin is with drugs, but this man might not have that much time... via Animal Planet