A ganglion is a small fluid-filled cyst that can be found under the skin or in deeper tissues. Ganglions are most common in the wrist, foot, and ankle joint. Common symptoms of ganglion are:

presence of a soft lump under the skin,
possible soreness in the joint with the lump in it,
possible palpation of the muscle tendons near the ganglion

Treatment of a ganglion includes types of procedures: aspiration of the contents of the nodule, administration of a steroid block to the nodule, or complete removal of the ganglion.

Most ganglions are painless and do not require treatment - observation of the lesion is sufficient management. When ganglion causes local pain or causes compression of a nerve or blood vessel, the ganglion should be removed.