Ganglions can be tricky. This is just a guess- You can have something that looks like and feels like a ganglion, but be a close relative, for example a villonodular tenosynovitis. These can have pigmentation. You might need to have this surgically removed, since it returned so quickly.
Perhaps you should see someone sooner.
Good luck
Posted By Vivian Abrams DPM on July 18, 2003 at 21:20:15: