Oh boy, acne has been a fun journey for me and it has mostly calmed down now. But the calming down was and still is an ongoing battle.
First, I looked at my diet. Skin is an organ, right? So it should stand to reason it will reflect when bad stuff comes in. So, stopped eating junk food (most of the time), stopped eating gluten/casein/most soy and drank a lot more water and less soda. That took care of about 80% of the cysts.
The water here is pretty hard and being close to the city, heavily chlorinated. Apparently, this drys the crap out of your skin, destroys what vitamin e you have on your skin and makes the toxins and minerals have an easier time getting in. Pass on that!
I wash my face with water that has some dissolved vitamin c powder in it and use alcohol-free rose witch hazel with vitamin e afterwards (Thayers).
Some acne isn't acne at all, but just clogged pores. So exfoliation is key - I adore the basic dissolved aspirin and honey mask. If you're oily, you need to exfoliate every day though and the Clarisonic is really, really nice, but it's a costly investment that does have a period of purging, so that's something to consider.
In terms of cleansers, Desert Essence tea tree cleanser and if you want to get indie about it, One Hand Washes The Other Black Magic soap. DE is foamy and medicinal smelling and OHWTO is really creamy (even for a bar soap!) and reminds me a bit of licorice.
In terms of treatments - sulfur. Kate Somerville's Eradikate is amazinggg and I love Nelson's Acne Gel for the lighter stuff.
Hope that helps and remember, ymmv.