About how long do you think it will take for my acne scars to fade?

im egyptian and lebanese so i have tan skinn and when i popped my pimples my skin is very sensitive to scaring so i got little scars all over my forehead and my cheek. there just flat brownish spotss and i really want them gonee. ive been using mederma and vitamin e capsules. how long do you think it will take for them to fadee?