Necrotizing fasciitis is an important disease caused by multiple bacteria resulting in necrosis of the skin and soft tissue. Swelling, discoloration and bullae formation may be observed in the affected area. The presence of crepitation under the skin on palpation is a warning sign for necrotizing fasciitis. In our case, necrotizing fasciitis was considered as a preliminary diagnosis after a comprehensive systemic examination in a patient admitted to the emergency department with hyperglycemia. The diagnosis was confirmed by imaging, but the patient died before treatment could be started. Since the mortality rate is quite high, rapid diagnosis and initiation of treatment is very important.