It seems unfair to have to worry about pimples long after your teen years, but adult acne is actually quite common. These breakouts can usually be traced to hormone fluctuations and stress, that can trigger an increase in sebum production, which causes acne. You can fight back by using products formulated with salicylic, lactic, or glycolic acid. All help clear pimple-causing debris, fight bacteria, and contain hydrating properties. You can find these acids in cleansers, moisturizers, and spot treatments, but exercise caution: Using more than one anti-acne product at a time as part of your daily routine may lead to skin irritation.