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10 days is a short time ,but you can lighten it up by getting a chemical peel (glycolic or salicylic acid
).Result would depend upon the depth of pigmentation.Always use a sunscreen three time a day.Night you can use creams like tretinoin
on spots.But you need to consult a dermatologist
who can guide you correctly.But if you want some thing immediate ,the camouflage is the answer like dermacolor.