How to Remove Sun-tan Caused by Years Under the Sun?

I have a fair body-hands and even partly neck. but my face 2-3 shades darken.because I live in a hot climate and while I always really care about sun,but my skin color has been changed. now I'm a 24 year-old girl and I want my face complexion be equal as my hands.what can I do? in a more speedy way? thanks

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