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Ganglion Cyst Quick Overview. A ganglion cyst is a tumor or swelling (benign, not cancerous) usually on top of a joint or the covering of a tendon (tissue that connects muscle to bone). It looks like a sac of liquid (cyst) located just under the skin. Inside the cyst is a thick, sticky, clear, colorless, jellylike material.
What is a ganglion cyst? A ganglion cyst is a fluid-filled lump found below the surface of the skin. It is often painless, but depending on its location it may cause enough discomfort to require treatment. Ganglion cysts occur most frequently on the joints and tendons of a personâs wrist, a large majority being found on the top of the wrist.