How to lighten or get rid of dark spots (skin pigmentation)?

I have dark 4 really dark spots on my face. Many Many years ago, I went to a dermatologist and had them "lazered". I was told It was skin pigmentation. If my makeup isn't on thick on those spots, and I'm outside in sunlight, these spots get even darker, and even harder to cover up. I'm 54 and I'm guessing it was like 30 or so years ago I had them last lazered. Is there anything I can buy to lighten them or even better get rid of them? Or any current procedures that will get rid of them? Please help!

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