Cysts in the arm mainly occur in the area of tendons or tendon sheaths and are related to chronic strain on the patient. The conservative method usually uses a sterile syringe to extract the fluid from the cyst and disinfects the skin, but although this method is less harmful and simpler, it is easy to relapse and cause recurrent cysts. Surgical excision is also an option, which is usually performed under local anesthesia and must be done with complete peeling of the lesion and postoperative suturing. Drainage strips can also be left in place. Whether you take conservative treatment or surgical excision, you should combine work and rest in general to strengthen your resistance, and for conservative treatment patients should be reviewed regularly.