Hyperpigmentation?

Have any of you ever had hyperpigmentation from acne? How long until it went away? What did you do to treat it?

*Hyperpigmentation = dark spots on face from excess melanin.

I had a lot of acne last year but now all of the pimples (except for a few) are gone and now my skin is smooth ... except it's totally red/pink and looks really bad.
Hyperpigmentation?
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