Excerpt from the June 2013 edition of American Spa magazine. By Maryann Hammers What you don’t know about sunscreen can kill you—literally—or at least etch your skin with wrinkles. Leading dermatologists answer the most commonly asked sunscreen questions. Nothing ages skin faster than sun damage. More ominously, one American dies from melanoma every hour, according to the American Academy of Dermatology. So the choice to apply sunscreen is a no-brainer. But you may not know how to get the maximum protection. “Everyone reading this is probably using too little and applying too infrequently,” says Talia Emery, M.D., medical director of Remedy (Westlake Village, CA), a cosmetic dermatology center. “More is better. Trust me, you’ll thank yourself later.” Here are some questions you may have about sun protection, with answers by some top dermatologists. When shopping for sunscreen , what ingredients should you look for? Sunscreens come in two basic forms. The most common ar