Dorsal tendon sheath cysts are cystic masses around the small joints on the dorsum of the foot. The exact etiology of these cysts is not known at this time, but they are usually considered to be related to chronic soft tissue strain in the foot. Small and asymptomatic cysts can be observed and followed up temporarily. For larger cysts and discomfort, there are usually three methods: First, squeeze the explosion method, using fingers to squeeze, so that the cyst burst disappear. Second, pumping fluid and playing drugs method, using a syringe to pump out the cyst fluid in the cyst, and then playing hormones, so that the cyst wall adhesion, so that the swelling disappears, but these two methods are prone to recurrence. Third, surgery, through surgery can be completely removed the root of the cyst, not easy to recur.