Are there any downsides to sheet masks?

Recently, the scientific research portal Scientific Reports published the results of a study of sheet masks, conducted jointly by scientists and doctors. During the experiments, it was possible to find out that fabric masks should not be kept on the skin for more than 20 minutes, since they contain phenoxyethanol and methylparaben (these are preservatives that are used as preservatives in masks). Unfortunately, they remain on the surface of the skin along with useful components. It turned out that the level of their negative impact on the skin is doubled after 20 minutes of exposure to the skin. Contact of the epidermis with phenoxyethanol and methylparaben is fraught with allergic reactions and dermatitis. It is important that people with sensitive facial skin, which is already prone to reactive rashes and redness, be treated with extreme caution.