Ganglion cyst

A ganglion cyst is a bump or mass that forms under the skin. A swelling on the back of the wrist or fingers is the most obvious sign. They can be painless but are often associated with tenderness, which may restrict the range of movements. Most commonly, ganglions are seen on the wrist (usually the back side) and fingers, but they can also develop on the shoulder, elbow and knee. These form when tissues surrounding certain joints become inflamed and swell up with lubricating fluid. They can increase in size when the tissue is irritated or just appear to grow. However they are not tumours or cancerous. Ganglions are harmless and if there is no pain or other complications they are usually left alone. They sometimes just disappear anyway. Initial treatment may simply involve limiting the activities which place a strain on the affected area, resting the joint, supporting it in a splint. Draining the fluid from the cyst may help ease symptoms. If the ganglion is persistent surgical removal may be recommended.