Unless blessed with perfect skin, you've probably been hearing about salicylic acid and benzoyl peroxide since you hit puberty. It's time to add a new, and surprising, ingredient to your zit-zapping arsenal: sulfur! While salicylic acid exfoliates and benzoyl peroxide dries, this age-old ingredient does a little of both—removing dead skin cells and oil to banish pimples fast. Read on for what formulas work best, what strengths you need, and how to properly apply the medicine.