Acne is a good way to learn self-experiments for teenagers. I offer tips on what one could do, and an initial list of crowdsourced interventions to test from CureTogether.
I suggest that teenagers interested in experiments, statistics, or Quantified Self experiment with interventions to reduce acne, listing the advantages of the topic.
To suggest specific cures, I re-analyze & rank the April 2016 CureTogether crowdsourced ratings of ~113 acne interventions.
Food interventions rate highly after standard retinoids & benzoyl peroxide, and so might be worth closer investigation.