Necrotizing fasciitis may present with localized redness, swelling and pain, numbness, bloody blisters, foul-smelling exudate and other symptoms, and it is recommended to consult the hospital in time. 1. Localized redness, swelling and pain: in the early stage, it can be manifested as localized redness and swelling of the skin, presenting purplish-red flakes, accompanied by pain. The disease progresses rapidly, can spread to the whole limb, skin redness, swelling, tenderness, border is not clear. 2. Numbness: mainly caused by inflammatory substances stimulation, early manifestation of severe pain, after the destruction of sensory nerves, pain can be replaced by numbness symptoms. 3. Bloody blisters: blisters containing bloody fluid appear due to the black color of the skin and destruction of blood vessels. 4. foul-smelling exudate: the fat, fascia and other tissues under the skin are edematous, turbid, and eventually liquefied and necrotic, and the exudate is foul-smelling. Necrotizing fasciitis should be timely hospital consultation, the doctor according to the condition to take appropriate treatment program.