Sheet masks are packed with nourishing ingredients that can work wonders on your skin. These serum soaked sheets can address a variety of skin concerns and are very convenient to use. Leave the sheet mask on your face for 10 to 15 minutes, then continue on to the next step in your skincare regime without washing off the serum that it leaves behind. You can use the excess serum from the sheet mask on your neck and hands as well. Here are the 4 beauty benefits of sheet masks.