The concerning trend that’s popped up on TikTok involves applying high-SPF sunscreen sparingly, only touching the high points of your face where you’d put highlighter, then sitting in the sun with the hope of achieving a contoured effect via tan lines where you’ve skipped the sunscreen.

Dermatologist Joshua Zeichner, MD, says this kind of contouring is not only ill-advised; it’s very dangerous.

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