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I guess you are talking about dark patches on the cheeks ,and if it is so then it is called Melasma
.It is a very resistant condition .The most important thing would be to use a good sunscreen daily thrice.
At night you can use a triple combination cream or hydroquionone cream or tretinoin
cream over the patch.
Since these cream are prescription based creams you need to consult a dermatologist
for the same.
So kindly consult a dermatologist for the same.