I used something called Basiron (swedish brand) AC 10%, this is the "strongest one".
I would say for all of you,
buy the least strong one, you don't want to expose your skin to unnecessary harsh conditions.
A model gave me this tip,
use a VERY thick layer and put it where it is the most needed only! Wait for it to dry, wash it off, then repeat but the second time don't wash it off! Put a towel on your pillow (to avoid bleaching) and sleep with it on your face!
Do this max.. 3 days in a row because it will even after the first day feel like your face has tightened up! I used to do this (when my acne was at its worst) about once a month, like a rehab treatment hah!
Now from time to time I use it on my smaller pimples or when I get hormonalbreakouts or one huge zit somewhere very exposed...
When you start to use this MOISTURIZE. Dont care if oilfree or with oils WHATEVER.
Just use something on your faces people!! Even if you at the beginning do not even see flaking, this still dries your skin out from the inside..
I do recommend this stuff because it is cheap and it works if you know your skin.
If you have real acne then do not use this because it is too strong, Dermalogica are expensive but I swear by their every product. They changed my life. Just invest in one product and you will see and feel a difference..
Good luck, and remember that acne is nothing to be embarrassed about! Many ppl go through this so you are not alone!!!