An immunocompromised 60-year-old male presented with a life-threatening chest wall necrotizing soft tissue infection following a minor trauma. Initial symptoms included swelling, erythema, and pain, rapidly progressing to necrosis. Diagnosis was confirmed through surgical debridement and microbiological analysis, which identified a polymicrobial infection involving *Finegoldia magna* and *Helcococcus kunzii*. The patient underwent extensive surgical management and broad-spectrum antibiotic therapy, leading to a prolonged recovery. This case highlights the aggressive nature of necrotizing soft tissue infections in immunocompromised individuals and the importance of prompt, accurate polymicrobial identification for effective treatment.
Key note: Early and aggressive surgical debridement combined with targeted antimicrobial therapy is crucial for managing polymicrobial necrotizing soft tissue infections, especially in immunocompromised patients.