Tendon sheath cysts in your child’s wrist can be treated by squeezing them with pressure if they are found early. If they are large and long-standing, they can also be removed surgically. Tendon sheath cysts are caused by increased exudation of synovial fluid from tendons and tendon sheaths due to repeated friction. If the cyst is detected early and the wall is thin, it can be pressed and squeezed to make it heal on its own, but there is a certain chance of recurrence. The cystic fluid can also be suctioned out through puncture, and then pressure bandage can be applied to make the cystic wall adhesion healing. If the cyst is large or has a thick wall, it can be removed surgically, which will heal the cyst, and recurrence is usually rare. If a child is found to have a tendon sheath cyst in the wrist, it is recommended that the patient go to the hospital in time to improve the examination and receive regular treatment.