Necrotizing fasciitis is a progressive infection of the soft tissue. As it can be idiopathic, it also can be secondery after a trauma, foreign body reaction or surgery. It often seen in older age patients with diabet. Obesity, smoking, alcoholism, use of steriods, immunsuppression, chronic kidney failure are the predisposing factors of the evolution of disease. It can keep the cutaneous and subcutaneous tissues or fascia. Breast involvement is rare on the literatüre. On our case which is required urgent necrosectomy and debridement, the patology has progressed quite rapidly. In case of probability of chest wall involvement, urgent necrosectomy and debridement is anavoidable.