Skin on face has started to darken, how can I fix this? (photos)

I am 27 years old women my skin has started to darken around my lips and mostly all over my face its visible even after using foundation looks very dull as well i have quit smoking is been a year and more i use to drink alot but quit that too m very worried going to be getting married please help as i have alot of darkening happening thank you.

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