What are the symptoms of necrotizing fasciitis from tooth abcesss?

Necrotizing fasciitis: Necrotizing fasciitis of the face is extremely rare. Symptoms include increasing pain in short amount of time, more severe than the abcess itself, redness and warmth around the tooth or elsewhere on the body, flu -like symptoms, extreme thirst (from dehydration) in the first 24 hours. Later symptom include violet-colored marks that become blisters filled with dark, bad smelling liquid.