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It is not possible to change ones color only in few days.And it also depends upon various factors.You have not mentioned your gender ..kindly do so.There are procedures which can help improve your complexion like chemical peel ,microdermabrassion ,dermaroller
,lasers etc.There are creams also available which can help to improve your complexion ,but as mentioned it depends upon various factors.
So consult a dermatologist
who has above facilities ,but please have realistic expectations and remember that results also vary from patient to patient.