What are the symptoms of necrotizing fasciitis of the foot?

What are the symptoms of necrotizing fasciitis of the foot?

1. Necrotizing fasciitis of the foot often occurs on the basis of existing surgery, trauma and disease. The symptoms are more severe than before, with obvious local swelling, rapid development and even impaired consciousness.

2. Necrotizing fasciitis of the foot is mostly acute, but a few occur in a chronic form. Local symptoms are similar to general tissue infection. Because the incidence is mild and hidden, patients often fail to notice it, so the infection affects the whole body within 24 hours. Early symptoms are redness, fever, hardening, purple flaky swelling, unclear borders, and intense pain. Patients may have flu symptoms, including fever, chills, diarrhea, vomiting, limb weakness, tachycardia, and muscle pain. At this time, subcutaneous tissue necrosis, lymphangitis, and lymphadenitis are rare because the lymphatic channels are rapidly destroyed. This stage usually lasts from a few hours to a few days. Some are misdiagnosed as other diseases, such as cellulitis.

3. When the sensory nerves in the lesion are damaged, the local severe pain of the early infection can be replaced by numbness or paralysis, the pain can be relieved, and there is a feeling of numbness in the affected area. When the disease enters the middle stage, the local infection becomes more bright red, the skin color gradually becomes purple and black, the blood blisters and blisters caused by vascular embolism and nutrient vessel damage gradually increase, the pain and swelling intensify, and the systemic symptoms become serious. In the third or final stage of the disease, it manifests as a persistent high fever, a significant increase in white blood cells, obvious toxemia, hypotension, diffuse vascular coagulation, toxic shock, unresponsiveness or loss of consciousness, acidosis, and multiple organ failure such as kidneys. Vascular obstruction leads to dry gangrene of the skin and epidermal separation, surrounded by red halo necrosis and black scabs, similar to third-degree burns. When the symptoms of poisoning gradually worsen, most patients eventually die of sepsis or shock.