In Your 20s

Younger women should start their attack on breakouts by opting for lightweight skin-care products, because their skin still produces a fair amount of natural oils. "I tell my patients to look for non-comedogenic gels, lotions, and serums that won't further clog pores," advises Friedman. "Also, you don't want to overdo it with harsh cleansers, so find a gentle wash to use daily."

DDF Blemish Foaming Cleanser, $30; drugstore.com