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Priya ,it is very important to use a good spf medicated sunscreen daily every three hours.
Along with this you can use a hydroquinone
based cream at night whole face .Use this little cautiously so that it doesn't cause any burning sensation or redness
You can also consider using kojic acid
creams with vitamin c
cream in the morning over the sunscreen .
But this would take a while to get the original color back.
Hope this answers your query,if you have any further questions ,kindly write back to us.