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Wear Sunscreen
As I always say, never underestimate the importance of sunscreen! You should be applying a broad-spectrum, physical sunscreen every day – whether it’s the height of summer or the middle of winter. UV rays from the sun damage your skin year-round, and as sun damage can cause and worsen pigmentation, it’s important to ensure you’re protected.
However, it’s doubly important to use sunscreen after applying tyrosinase inhibitors, like retinol, as they leave your skin even more vulnerable to the sun’s UV rays.