Summer is back! Here is how often experts say to reapply sunscreen (opens original article in a new tab)

Experts advise reapplying sunscreen every two hours, especially after swimming or sweating, to protect against skin cancer and UV damage. They also recommend applying it 15 minutes before sun exposure and using a sufficient amount.

• Sunscreen should be reapplied every two hours, especially after swimming or sweating.
• Skin cancer is the most common cancer in the U.S., with over 5.4 million non-melanoma cases treated in 2012.
• Experts recommend applying sunscreen 15 minutes before sun exposure and using at least a shot glass-sized amount.