It may say SPF 30 on the bottle, but if you're not applying your sunscreen correctly, you may only be getting SPF 4! Beautylish chats with New York City dermatologist Dr. Macrene Alexiades-Armenakas to find out what's the right amount to use. "The American Academy of Dermatology recommends one ounce—enough to fill a shot glass—of sunscreen to cover your entire body," Dr. Alexiades says. But what about for your face (which you should be protecting every day of the year, rain or shine)? "I recommend a teaspoon on the face," says Dr. Alexiades. Don't forget the tops of toes, a common spot for scary skin cancer moles. The AAD also recommends a minimum of SPF 30 on the face, lips and body, so step away from that SPF 4 dark tanning oil! Beauties, now that summer's here, please put on your sunscreen and protect yourself from spots, wrinkles, burns, and (gasp!) cancer.