Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of Necrotizing fasciitis ?
    ### Response:
    What are the signs and symptoms of necrotizing fasciitis? Symptoms often begin within hours of an injury. Intense pain and tenderness over the affected area are often considered the hallmark symptoms of necrotizing fasciitis (NF). The pain is often described as severe and may raise suspicion of a torn muscle.
    