Arm cyst is a common benign swelling in orthopedic clinic, which can be treated conservatively or surgically according to the specific situation, as follows: a. Conservative treatment: one kind of treatment is to use a syringe to draw out the cystic fluid in the cyst, and then use an elastic bandage for localized compression bandage. The other is that if the cyst is located on the dorsal side of the wrist, the wall of the cyst can also be squeezed by hand, so that the cystic fluid inside the cyst will flow out and spread. The above two treatments are easy to recur after healing. Second, surgical treatment: if the cyst recurs after conservative treatment, it is recommended to adopt surgical treatment, in which the cystic fluid can be withdrawn first, and then the wall of the cyst can be peeled off, and the wall of the cyst can be completely removed, and the recurrence will rarely occur after the operation.