The patient has a hard package on the surface of the foot, which looks like a bone. It is recommended to go to the hospital to see an orthopedic surgeon, and if necessary, to do local ultrasound, X-ray, or even CT to make a clear diagnosis, as follows: a. Benign swelling of the bone: the most common is a bone cyst or osteochondroma on the surface of the foot, both of which are benign swellings of the bone. If there is no local pain and it does not affect walking or other life, no special treatment can be required. If there is pain or affects the usual life, it is recommended to give surgery to remove. Local tendon sheath cysts: usually caused by the stimulation of the dorsal foot and ankle joint by frequent walking activities. If it is a relatively small tendon sheath cyst that has no effect and no pain, you can try conservative treatment such as pressing it, or using a syringe to puncture it and extract the fluid inside. If it is serious enough to affect your normal life, you can also consider surgery to remove it.