I'm a 21 year-old male. I've had mild acne since my early teens, and currently it translates to a few raised red spots on my face and many more on my back and shoulders in an average week. The more stressed I am in a week, the more spots I tend to get.
I've never really done anything about my acne due to an initial lack of knowledge about skin hygiene, and feeling too overwhelmed about all the information that was out there to start anywhere. As a result, the last few years of damage have also left me with a pockmarked forehead. I'm now determined to improve my skin to make it smooth and healthy again, but need to know how to go about doing this.
a) What are the root cause(s) of acne?
b) What are the most effective, scientifically-proven ways to clear it up?
c) Is it possible to undo the damage of the last few years on my pockmarked forehead in order to make it smooth again?
Thanks in advance to anyone that can provide me with a sourced, definitive answer - I'd really appreciate the help.