Especially during summer, a daily slathering of sunscreen is essential weaponry against skin cancerโ€”not to mention future sun spots and wrinkles. But as late-season heat waves roll in, that SPF youโ€™ve been diligently applying might lead toย suffocated pores and ruddy patches of inflammation, especially if youโ€™re not taking the time to properly remove it each evening.

โ€œIt is not dangerous to fall asleep with SPF, but donโ€™t be surprised if you wake up with a face full of acne!โ€ warns Manhattan-based dermatologist Dr. Lisa Airan, M.D.