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If your complexion is genetically dark then nothing much can be done .If not,then you must use a good sun blocking cream at least three times day.There are certain creams which are known to lighten up the complexion like -glycolic cream,hydroquinone
cream etc.You can try any of these creams which ever your doctor suggests.
Along with this you can also go for chemical peel procedure which can improve your complexion.Make sure to take chemical peels
only from a dermatologist
Please don't get carried away by various advertisements in TV claiming to lighten the color.I've never seen them working.