What is Tewl?
Transepidermal water loss (TEWL) refers to water loss that passes through the epidermis and evaporates into the air. It’s a natural process that helps your skin regulate water content. However, dry weather, skin damage, and drying skincare products can exacerbate TEWL, and cause dry skin. If you notice extra dryness, flakiness, dullness, or visible fine lines, your skin could be losing too much water through TEWL. To reduce TEWL, use a humidifier if you live in a dry environment, moisturize regularly, and avoid harsh facial cleansers or products with active ingredients.