Your doctor is wrong. They do come and go and unless they're painful there is absolutely no reason to risk surgery. I have had two and slammed one with a book (actually my DH did...true love) and the other just lives on my hand
I wouldn't necessarily trust the surgeon either, kind of like asking a sales clerk if you should buy something today. I would also make sure your insurance would cover it since it may be considered cosmetic if its not painful.