Even if sunscreens say they’re waterproof, they’re not. Sunscreens can wash off with sweat, or just being in the water. When this happens, their sun protection washes off, too, leaving users at greater risk for burns, premature skin aging and possibly even skin cancer.
So the Food and Drug Administration has set new rules to help people know what they’re getting and when to use it. FDA dermatologist Jill Lindstrom:
“Sunscreens may only use the term `water resistant,’ and must clearly indicate how long water resistance actually lasts.’’