acne marks fade off with time as new cells start to form on your skin!!

If u want to hasten healing of scars faster, you have to exfoliate your skin mildly every day (but u have to avoid it in case u have acne on ur face)

Exfoliating, brushes off old cells on your skin and surfaces newer cells......so you got to apply sunscreen too if u exfoliate as new skin would be tender and prone to more damage.....

I suggest you to go for oatmeal scrub (banjaras products r good)......to scrub your skin gently everyday.......

Natural scrubs are sugar granules but they are too harsh for skin...........so better oatmeal or apricot scrub.....

Apart from that, besan mixed with milk and few drops of lemon juice lightens acne marks quite efficiently