Necrotising fasciitis is a rare but deadly bacterial infection causing soft tissue and fascial necrosis. It is associated with a mortality rate of 25%. It is characterised by; erythematous skin, which turns dusky blue before haemorrhagic bullae develop; localised pain; and inflammation. It is most commonly found in the extremities, the abdomen or the perineum but is rarely seen in the breast.We describe a 54-year-old lady who presented with breast erythema and raised inflammatory markers. Initially treated as cellulitis, however when her symptoms did not improve and despite IV antibiotics her bloods worsened, a CT scan was performed which showed a large volume of interstitial soft tissue gas with diffuse fat stranding, consistent with necrotising fasciitis. Debridement of her breast alongside the use of sensitive antibiotics and ITU support led to a satisfactory outcome.We discuss how an early diagnosis can be made by the recognition of a triad of symptoms common in necrotising fasciitis, and how optimal management can be achieved with the incorporation of imaging to successfully identify the condition and allow targeted debridement of the areas of necrotising fasciitis.A high index of suspicion should be held if pain is disproportionate to the signs or sepsis is present. To aid an early diagnosis, imaging of the breast should be performed early to avoid delay in treatment.