I'm 25 and have had to deal with acne for most of my life. After a few rounds of accutane and laser surgeries, my face finally cleared up, but all of a sudden I started getting breakouts on my neck - something that's never happened before. Painful, uncomfortable, and embarrassing. I tried to use retin-a for a few weeks, but it didn't help much and completely dried out my skin to the point where lotion wouldn't even get rid of the flakes. Long story short, went into my box of Birchbox goodies and rediscovered this serum. Overnight I saw a dramatic difference. Two days later, and the breakout on my neck is almost completely cleared. I will 100% be buying the full size of this!!