First of all the ONLY way to avoid scarring is to STOP picking on u're pimples! Try the cinnamon and honey paste that I've mentioned before. And even equal quantities of lime juice and rosewater (leave it on for half an hour)
Antibiotics do work if u're acne is severe (I blv 20 pimples is acute!) go to u're dermatologist and treat u're acne from the root he may prescribe retin A, skinoren, or eldopaque for the scars.
1.) Please keep u're fingers away from u're face!
2.) Use an anti-bacterial facewash/cleanser
3.) Keep u're hair away from u're face
4.) Change u're pillowcase often
5.) Cure dandruff if u have any.
6.) Use water-based products on u're face.
7.) Drink plenty of water.
Afsoon, I have given a basic recipe for home-made ubtan which u may try!