If you wear sunscreen on your face every day, you probably think you’re covered.

You may not be. At least not your lips. Most women think their lip balms and glosses have got them covered, but experts say they’re dangerously mistaken. In fact, certain lip balms and glosses can actually increase your chances of developing a skin cancer. Even worse—many of us unknowingly attract the sun’s rays to our lips by using balms and glosses, according to Christine Brown, MD, dermatologist at Baylor University Medical Center at Dallas.

Apply a lip sunblock with an SPF of 30 in the morning under any lipsticks or glosses. Then reapply throughout the day just as you would reapply a lip color.

If an area of your lips turns opaque or white or peels or flakes, have your doctor check it out. Lower lips are more at risk for sun damage.