Sores are a general term for a group of infections of the human body causing suppurative infectious diseases of the body surface, including all body surface surgical diseases, and the sores that tend to be crippling are gangrenous. Necrosis refers to the necrosis of tissues which, due to secondary infection by putrefactive bacteria and other factors, presents special morphological changes such as black and dark green, including wet gangrene and dry gangrene, with wet gangrene being the most dangerous. Dry gangrene is mostly seen at the ends of the limbs, for example in cases of atherosclerosis, thromboembolic vasculitis and frostbite. Wet gangrene may cause tissue necrosis leading to disability due to the more rapid development of the lesion and the more diffuse inflammation. At the same time, the toxic products and bacterial toxins produced by tissue necrosis and corruption are absorbed, which can cause systemic poisoning symptoms and even death by toxic shock. If you find yourself with sores, no matter how the symptoms, patients should go to the hospital in time for treatment to avoid the deterioration of the condition.