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Priya you haven't explained how you got these marks ..are they after you had pimples
or are these after any injury
or freckles or moles
.If they are after pimples then you can use Retino-A(.025%) at night only on the spots for couple of hours and then wash it off.Morning you should use UVAVO (SUNCREEN) full face three times a day.You should be careful using retino at night as it causes peeling of skin .If you are comfortable using it then gradually increase the time of contact to over night application.I, in my clinic do chemical peels
for the same if creams doesn't work.