Ganglia are cystic swellings under the skin, generally in the wrist or the upper surface of the foot. A ganglion can develop on the top of the foot, on the front of the wrist, or in the fingers.

Usually rubbery to the touch, a ganglion may vary in size. Ganglia are often no bigger than peas. They may be soft or quite hard, and they are usually either painless or only somewhat bothersome.

A ganglion develops when a jelly-like substance accumulates in one of two places - a joint capsule or a tendon...