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12th May 2019
07:20am BST

Celebrity facialist Sarah Chapman revealed to Cosmopolitan that it’s a common skin sin of many.
“Adhering to the time recommendations of any type of sheet mask is very important because the benefits only apply while the mask is still wet,” she told Cosmo.
“When the mask dries out it will actually begin to draw moisture and vitamins away from the skin, rather than to nourish or hydrate it as intended.”
In fact, leaving a sheet mask on for too long can also result in irritation and make your skin more prone to acne, according to the expert.
So, now you know – follow the rules for optimum results.