Sounding like something out of a horror movie, a smallpox demon is actually far more scientific.
Or a mix of science and centuries-old Japanese history.
Although eradicated in 1980, smallpox created fear for centuries across the globe. The infectious disease caused a fever, vomiting, sores and skin rash. It even led to bumps that would scab and leave scars all over the body.
The smallpox demon comes from Japanese culture and believed to be the source of all smallpox epidemics in Japan. In medieval times, people would try to appease or attack the demon since there was no other source of reliable, effective treatment.