"What is your skin type?" Ah, the question that appears to be so simple yet consistently flummoxes so many of us. There’s a confusing jumble of options to choose from: Sensitive, Delicate, Dry, Aging, Sun-Damaged, Very Oily, Oily, Combination, Mature, Acne—and then there’s Normal. Which begs the question: does that mean the rest of us are abnormal? (The answer, emphatically, is “no.”) We sought to simplify the process a bit and put this guide together with aesthetician Julia March's help.