Ginger can be difficult to peel with its irregular shape. Trying to remove the skin without taking any excess ginger with it is even harder. Fortunately, ginger skin comes off relatively cleanly with just a spoon.
As Gourmet Magazine points out, scraping ginger with the edge of a spoon can provide enough pressure to pull the skin right off. This not only makes more efficient use of your ginger, but it's safer than using something with a blade to peel it.