Cyst
Cyst is a closed sac. Cyst may contain air, fluids, or semi-solid material. A collection of pus is called an abscess, which is not a cyst. The cyst may need to be removed surgically, but that would depend upon its type and location.
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Ganglion cyst ― Asymptomatic lumps that occur suddenly between joints. If the diagnosis of ganglion cyst is confirmed, the problem may be solved by pressing the nodule hard to burst the cyst inside.
