The most common factor is infection of the knee joint and lower extremities. The lower extremities are susceptible to invasion and infection by bacteria, viruses, fungi or other pathogenic microorganisms, especially in the ankles, heels and nails, where the toenails can become infected with nail infection and lead to local cellulitis. 2. Bone and joint diseases such as knee injury, knee meniscal osteoarthritis, and knee meniscal anterior longitudinal ligament injury may also cause sweating from the lower legs, but not from the body. 3. The situation is not sweating.