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Q: I have a bump on the top of my foot. It feels as if it has fluid in it when I press on it. What is it?

A: It is most likely a ganglion cyst. These fluid-filled cysts most often appear on the top of the foot or the wrist. They are associated with herniation of the connective tissue around joints or tendons, often caused by pressure or injury to these tissues. These cysts may be painless, but at times, they may become painful, depending upon their location and size. Painful cysts can sometimes be drained in the office, although surgical removal is suggested for recurrent cysts.

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