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Ganglion Cyst

An extremely common cause of benign lumps anywhere in the body, ganglion cysts arise usually in the wrist, the base of the finger, or on a knuckle. The cause is unknown, although there seems to be a correlation between awkward use of the joint in question. The cyst itself is a fibrous sac filled with clear fluid, which can change in size or even disappear entirely just to return later. It is the pressure this cyst places on nearby nerves or other delicate structures that creates the symptoms of pain, stiffness, and reduced range of motion.