The article highlights a clinical case of diagnosis and successful treatment of necrotizing fasciitis in a 4-year-old child. The clinical picture of the onset and course of the disease, the difficulties of differential diagnosis, as well as methods of diagnosis and treatment are described. It should be noted that this pathology in childhood develops at lightning speed. However, in the initial stages, it can proceed under the guise of other diseases, such as acute hematogenous osteomyelitis.