Answer by  
                                                                                          Moma123 (1043)
                                                            
                          
                          
                                                          Necrotizing fasciitis is rare form of infection of deeper layers of skin and subcutaneous tissues. It is caused by many types of bacteria, like, Group A streptococcus, Staphylococcus aureus, Vibrio vulnificus, Clostridium perfringens etc. It spreads across the facial plane within the subcutaneous tissue. This infection occure in people who have weak immune system.