Summer is officially glow season, but some of your favorite warm-weather habits could actually be sabotaging your skin.

To find out what not to do this summer, ET caught up with celebrity plastic surgeon Dr. John Layke, who shared the biggest skincare mistakes he sees during the hottest months of the year and how to avoid them.

First up: Overdoing it with heavy active ingredients.

“During the peak summer months, skin is more sensitive to the sun when using retinol, so decrease the frequency of usage to 3 days per week and ensure multiple reapplications of sunscreen,” Layke says.

But that doesn’t mean you should break up with retinol altogether…

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