A bone protruding from the dorsum of the foot may be a physiological phenomenon, or it may be an osteophyte, fracture, or tendon sheath cyst. 1. Physiological phenomenon: some people have high arches, coupled with a thin body type, it is easy to have a bone protruding from the dorsum of the foot. 2. Osteomalacia: due to foot trauma or long-term strain, it is easy to cause osteophytes in the foot, forming obvious bumps on the dorsum of the foot, which presses the surrounding soft tissues and causes pain. 3. Fracture: If the patient has a fracture of the foot, and the fracture is not treated in time or the prognosis is poor, it is easy to form a deformity, and then there is a bone protrusion on the dorsum of the foot. 4. Tendon sheath cysts: Tendon sheath cysts occur in the hands and the back of the foot, usually associated with soft tissue degeneration and chronic strain injury, patients can form a lump on the back of the foot, some of the lumps will be hard, and the patient feels like a bone bulge. The cause of a bone on the back of the foot is more causes, may also be related to gouty arthritis, bone tumors and other reasons, if the symptoms do not get better after resting, it is recommended to go to the hospital in time to find out the cause of the disease, targeted treatment, the use of medication, please follow the doctor’s instructions.