How to get rid of pigmentation and acne marks in two months?

i have no acne anymore but because of my asian skin its left brown marks on my nose and upper lip and chin. i know aloe vera helps but what else? not lemon juice, because im going india and being in the sun every day for 5 weeks will make it darker so i dont see much point in that.. what creams etc help? i use foundation on just the marks however it isnt very practial for india so lol please help?