I've always had acne-prone skin and now that i'm in the 30's, nothing's changed. My skin is only more sensitive (ie. dry and flaky if i use soap/cleanser but oily all the rest of the time). Last year, i was researching up and down trying to find a cure for my sudden cystic acne (that's the kind that's deep, painful and leaves long-lasting pimples). I read books, websites, posted on here, changed my diet, changed my cleansing routines, etc. and nothing worked until i started drinking apple cider vinegar. My skin cleared up within days and no more cystic acne. I eventually stopped drinking it, as my skin problems were gone and sure enough, a year later, i started having problems again, so i started drinking ACV again, and it cleared up--again. A week ago, i would've been embarrassed for anyone outside of my family to see me without make-up, now i'm going out without make-up.
I put a splash of ACV in a tall glass of water and drink this 2 or 3 times per day.
There's some info on here about it, but also on earthclinic.com.
Just wanted to share. :)