Necrotizing fasciitis is an infection / inflammatio.  it's rarely produced by bacteria that destroys the skin and soft tissues beneath it -including fats and muscles-.

Because of these infections people often dies quickly, a person with necrotizing fasciitis is sometimes -Sometimes said of infection / spread the bacteria "eat meat", in particular Streptococcus pyogenes.
Fascitis necrotizing is very rare but really serious. in approximately 30% of those who develop necrotizing fasciitis they die.