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There’s a figure that has been circulating on the internet for years, stating that SPF 50 provides only about 1% more protection than SPF 30. While that figure is factual, people have been doing the SPF math all wrong. Although the percentage is small, it has a much bigger impact than we can imagine.

HuffPost spoke to three board-certified dermatologists, including two Mohs surgeons (specialists in skin cancer), to explain what that means and help determine the type of sunscreen we should use and why.

What does SPF 50 do?

SPF stands for “sun protection factor” and refers to the amount of protection against UVB rays. Before picking a sunscreen, “You need to know what percentage of the sun’s UVB rays are being filtered. For instance, SPF 15 is 93%, SPF 30 is

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