Not much: Very few things can come and go like a ganglion cyst. Because ganglions are filled with joint fluid, and are connected to the joint, the amount of fluid in the cyst can vary rather quickly. Not much else will do this. Any type of solid mass would not change quickly. Sudden bleeding into a tumor may make it increase insize, but not go down. Allergic reactions like a hive can come and go fast.
Answered 7/3/2013
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Ganglion Cysts: The one type of cyst that typically fluctuates in size is the ganglion cyst. Synovitis or swelling post trauma might do the same thing.
Answered 7/7/2015
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Ganglions: When large groups of people with ganglions have been followed for long periods of time about 50% of the cysts disappear even without surgery.
Answered 2/21/2013
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