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If the complexion is darker genetically then nothing mush can be done,but if you have developed tanning,then there are some possibilities.You should first start using a good spf sunscreen daily.Along with this you can use creams like kojic acid,glycolic acid
cream locally on face.Procedures like chemical peels
and micro dermabrassion are also good for improving the complexion.So consult a dermatologist
for the best possible treatment.