From your description it sounds that you might be having a mucus cyst
. The treatment options include excision, which your doctor has advised and cryotherapy
. This is a procedure which uses liquid nitrogen gas to freeze the lesion, which would eventually shrink. You could discuss with your doctor about the options and decide on the one which you seem comfortable with. However, I do not think the ex soon procedure will affect your smile as the scar will eventually disappear and can be camouflaged with a lip colour.
Hope this helped you.