Sorry to hear of your dilemma.
I had one on my left wrist (the top of the wrist, not the palm side) for quite a few years. It was about the size of a large pea. I showed it to a friend of mine (who is a dentist) and he told me that his wife had one in the same place. One day, as she was making the bed she accidentally wacked it against the wall and it was gone. It grew back later and when she went to a doctor, he wacked it with a rubber hammer.
DISCLAIMER: I'M NOT RECOMMENDING THAT YOU DO THE FOLLOWING!!!....
So, I tried smacking mine with a heavy book.That worked, but it grew back. Every few months or so, I'd have to give it another wack. After a few years, though, that wouldn't work anymore. I needed heavier artillery, so I started using my folded up metal footstool. I had to smack really it hard!
After using this method for a while, I realized, "This really isn't the best idea!"
I considered surgery, but I remembered a pianist I knew who had surgery on both wrists. Each wrist now had a tiny scar on it with fresh gangions underneath the scars. So, I didn't much trust that idea either.
Eventually, I went to my Naturopathic doctor. He did some chiropracic adjustment of the left arm, esp. the elbow, and applied some acupunture needles in various places.
Then, he pulled out what looked like a large hypodermic needle. He said this was the fattest needle he had. ("Like a shovel")
He stuck it into the cyst and drained it.
That was 15 years ago and it hasn't come back since.
So, I guess my suggestion would be to explore alternative methods first that would be less invasive than surgery.
And DON'T try to fix it yourself!
EDIT: LOL! The other Alan posted his while I was writing this one! Hi Alan