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Arthritis (at the base of the thumb)

 

Mucous Cysts

This is also known as a dorsal digital ganglion cyst.  Usually in middle-aged or older people and associated with wearing out of the end joint of a finger.   Pressure from the cyst may cause a furrow in the fingernail. 

Occasionally the cyst fluid leaks through the thin overlying skin from time to time.  The risk of recurrence after surgery is around 10%, and problems after surgery include infection, stiffness, and pain from the worn out joint.