Here’s Why You May Soon Be Using Sunscreen in the Dark

TIME

The guidelines for sun exposure are pretty familiar by now—cover up exposed skin, steer clear of the peak UV streaming hours of 10 am to 2pm, and always, always wear sunscreen.

Now, in a series of experiments described in the journal Science, researchers say that may not be enough to shield against skin cancer. Working with human cells in a lab dish, as well as with mouse models, they found that melanin—which is produced in response to UV exposure to protect sensitive skin from being damaged—may have a dark side to its skin-protecting role. And, even more concerning, the harm triggered by the sun’s rays may linger long after the sun sets.

MORE:You Asked: Is Sunscreen Safe—And Do I Really Need It Daily?

Douglas Brash, professor of therapeutic radiology and dermatology at Yale University School of Medicine, and his colleagues say that activating melanin has lasting effects—some…

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