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how to get lighter skin through home remedies (please read)?

i don't want LIGHTER SKIN,as in change my skin tone to a lighter shade.
i'm a tanned complexion.
but i have had earlier trouble with severe acne on my cheeks and forehead.and my acne left hyperpigmented spots.
the spots are visibly gone now,but the area that was affected by the acne,has just developed this darker skin tone that is one shade lighter than my original one.
i'm not looking for treatment of spots here.i just want to bring the darkened skin back to normal.
it's not a skin problem.i've visited the dermatologist.
but he says it's due to the acne hyperpigmentation and it will take some time to fade naturally (like half a year or so)
but i've gone through the torture of acne itself for about 7 years now.and i can't go through another year of hiding my blemished face for another year.
please help.
home remedies that might lighten the skin tone.
sorry,i mean,it's one tone DARKER than my original skin tone (not lighter ).
also i said ''another year'' twice.
:)