What is the Best Treatment to Remove Brown Spots on the Face for Tan Skin? (photo)

I'm 16 w/ tan skin. I used to have 3 brown spots on my face when I was a kid. Now almost half of my face has brown spots. I don't know what these brown spots are. I had creams and peels and even IPL treatments but the spots remained. My dermatologist said it's impossible to remove them. I was hopeless. What other treatments can remove these brown spots? How long would it take to have them totally gone? Please help me. I really want a clear flawless face :( Thanks

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