Derms weigh in with the facts.
gets specific: "The skin barrier consists of the epidermis and, most specifically, the hard, outermost layer of the stratum corneum." The epidermis is what we typically think of as the outer layer of the skin, but it's made up of five layers. The outermost layer of the epidermis is the stratum corneum.
"The stratum corneum is a layer of actively shedding dead skin cells," says Guanche. "It's fortified with a latticework of remaining cell-to-cell connections and the contents of your oil glands that contain lipids."Put simply, the barrier works to keep good stuff in and bad stuff out. Essential water and electrolytes are sealed in, explains Guanche, which keeps skin looking smooth and dewy.
Just one caveat: A moisture barrier can be tricky to repair with home care if there is an underlying skin disease or severe skin damage, says Guanche. Visit your dermatologist, who can analyze barrier function using a measurement called Transepidermal Water Loss . In the meantime, just keep moisturizing.
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