Post-traumatic necrotizing fasciitis. Case report. This term was used by B. Wilson in 1952, although this condition was already known at the time of Hippocrates, and during the 19th century was associated with episodes of gangrene of estreptococico origin. The mortality from this condition even at the present time, and despite having effective antibiotic treatments, continues to be high, ranging between 7-76%. One of the reasons that contributed to these mortality figures is the delay in the diagnosis and treatment to shortages at times of local and/or systemic clinical manifestations. Describes a patient that developed Necrotizing soft tissue infection secondary to multiple injuries. Necrotizing soft tissue infections are often poli-microbianas skin infections, which are associated with tissue necrosis and which requires early surgery and antibiotic therapy for appropriate management. Such infections usually have a mixed aerobic and anaerobic biological etiology. If the diagnosis is made early and the treatment is instituted quickly, the Outlook is good.