Presenting case report of necrotizing fasciitis, a rare bacterial infection, bacteria grow in the superficial layer of the fascia and release toxins, causing the infection to spread through the fascia. This is a serious disease that spreads quickly and requires immediate treatment. Compartment syndrome is one of the complications of necrotizing fasciitis. The prognosis is reliable based on clinical examination and assessment of intracompartmental pressure. Severe pain is important sign of this. Either the relatively rigid and closed muscle space, which is enclosed by fascia and bone, experiences bleeding and oedema. The case is unique in terms of the misdiagnosis and complication of the disease. Patient ageing forty-four years came to an emergency room with the complaint of pain, redness and severe swelling in right leg in the last 7 days. He went to a local hospital a week ago where cellulitis was diagnosed but before 2 days the swelling and pain got severe and so he came in as an emergency. It was noted here that he was misdiagnosed by cellulitis and so Laboratory Risk Indicator for Necrotizing Fasciitis (LRINEC) score was performed which revealed the intermediate risk of necrotizing Fasciitis. He was immediately admitted to operation room for surgical procedure called debridement with fasciotomy, after the surgery antibiotic treatment started and was continued for a week. Along with this, dressing of the surgical site was performed. Plastic surgery was done at surgical site after 15 days. With this treatment the recovery was good and the therapeutic goals were all achieved. So, it is better that this type of diagnosis should be identify at stage-1 to decrease the mortality rate.