It was discovered by a guy name wilson in china
How And When Was Necrotizing Fasciitis (Flesh Eating Bacteria Disease) Discovered?
It was discovered in like the fifth dynasty BC or something like that
It was discovered in France in 1783, though I haven't managed to find the name of the person who discovered it. It may have been known to some doctors in ancient Greece, but official discovery was in France. You can find out more here.