Diabetic foot is not contagious and is not infectious don’t worry. Diabetic foot infection is an important cause of diabetic foot formation, development and deterioration and gangrene. There are many causes of foot infection, mainly including the following: 1. local factors such as foot skin injury, high-risk foot, dead space, poor drainage, etc.; 2. predisposing factors such as metabolic disorders, malnutrition, decreased immunity, etc. The foot is the target organ of complex diabetic multisystem disease. Diabetic patients with peripheral neuropathy, and peripheral vascular disease combined with excessive mechanical pressure can lead to destruction of the soft tissue and bone and joint system of the foot and bacterial proliferation, which can lead to a series of foot problems. Mild neurological symptoms to severe ulceration, infection, deformity formation, Charcot’s arthropathy (Charcot arthropathy, neuropathic arthropathy) and neuropathic fractures. If treatment is not aggressive and does not adequately address the symptoms and complications of the lower extremities, the consequences can be catastrophic. Therefore it is important for diabetic patients to carry out early prevention and treatment of foot problems.