Small bulges on the wrist may be tendon sheath cysts, lipomas, fibrous tumors, and so on. 1. Tendon sheath cysts: occurring in the wrist or the back of the hand and other parts of the wrist, mainly due to the movement of the local damage caused by cystic effusion, if the cysts are relatively small, you can generally observe, but also can be treated surgically. 2. Lipoma: it is a small cystic swelling that can be moved under the wrist skin, which is a common benign tumor of the skin with soft texture, good mobility and no pain, etc. If the lipoma is large, it can be surgically removed under local anesthesia. 3. Fibroma: wrist fibroma may be secondary to mosquito bites as well as trauma, there is a tendency to increase, can be frozen treatment, laser treatment and surgical treatment. The small bulge on the wrist, you need to actively go to the hospital, clear cause of the cause of treatment.