6 Reasons Why Sunscreen Is Essential, According to Dermatologists

Some facial sunscreens are specifically formulated for under-makeup usage to act as a primer or glow-enhancer. Others also do a bit of double-duty and act as a daily moisturizer, as well. Note that such products are different than cosmetics with built-in SPFs and should be used in conjunction with makeup.

"Makeup with SPF is not sufficient to protect your face in the morning, as you need a teaspoon amount of sunscreen to get the listed SPF. Instead, I recommend applying a moisturizer with sunscreen, or full sunscreen first, then your makeup overtop," says Dr. Marchbein. "To touch up throughout the day, a powder SPF can be applied over foundation and makeup without disturbing it."

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