A soft bag at the ankle is commonly associated with bursitis, joint diseases and other diseases, as follows: First, bursitis: there are bursae on the inside and outside of the ankle, which can produce acute or chronic bursitis after being subjected to wear and tear and trauma. Patients will show a soft package at the ankle, and there will be pain when pressing, and the local skin temperature will be significantly increased. Second, joint diseases: such as acute or chronic synovitis of the ankle joint can cause synovial hyperplasia, inflammatory synovial membrane protruding into the joint space, which will form soft pouches in the ankle area, with soft texture and pressure pain when pressed, while the patient has serious joint effusion, joint swelling and joint movement limitation, and joint pain is also obvious. The above two conditions can be relieved with timely treatment. In severe cases, surgical treatment, such as arthroscopic surgery and minimally invasive surgery, is required.