Help! Why is my face 4 shades darker than the rest of my body? Any solution?

When I was little my face and body was the same color. My face is now 4 or 5 shades darker than the rest of my body. But every time after shower, my face becomes the same color as the rest of my body and as time goes by it goes back to being 4 or 5 shades darker. I tried a lot of different creams and wears sun screen but it doesn't get any better. Why is it that it becomes white after shower but goes back to being darker as time goes by? Is it from within instead of the surface? What can I do?

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