A ganglion is a soft swelling which contains a thick clear fluid. They are very common in the hand and are usually attached by a stem to a nearby joint or tendon. The back of the wrist and back of the finger tip are the most common sites but they can also be found on the front of the wrist or the front of fingers.
A ganglion is harmless and most can be left alone. Some will disappear over time. If the ganglion is causing pain or a functional problem, it can be surgically removed. Aspiration of the fluid with or without injection of steroid can be used to treat the ganglion. This avoids an operation but has a higher recurrence rate than surgical excision. However even after surgical removal, up to 10% can recur.