Ganglion cyst : This could be a ganglion cyst. Does the ball get larger and smaller? Is it painful? Usually if this is problematic you can have it surgically excised. But aspiration of the ball and injection of the ball might be helpful. http://byebyedoctor.com/ganglion-cyst-foot-pictures-symptoms-surgery-treatment-removal/.
Answered 12/9/2013
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Couple of things: It could be a blister or it could be a ganglion cyst. See a doctor to determine if it needs to be drained.
Answered 10/23/2012
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