I have eczema that flares up badly in the spring and summer months. I've used a steroid cream for years and it always made the skin with eczema lighter than the rest of my skin. I'm not sure if that has to do with the actual eczema and scratching, but it could have something to do with the steroids.
Now, though, I use either Protopic or Elidel and that helps a lot. Elidel has been proved safe for children as young as two years old, and the best part is that it's not a steroid. Protopic also isn't a steroid, but works for moderate/severe eczema. Both have to be prescribed by a physician.