Esthetics Core Written Practice Test

What does TEWL stand for in skin care terminology?

1. Transdermal energy water loss

2. Transepidermal water loss

3. Total epidermal water loss

4. Transcutaneous evaporative water loss

The correct answer is: Transepidermal water loss

TEWL stands for Transepidermal Water Loss, which refers to the process by which water evaporates from the skin's surface. This phenomenon is critical in skin care since it is an essential indicator of skin barrier function and hydration levels. A healthy skin barrier retains moisture effectively, preventing excessive transepidermal water loss, which can lead to dryness, irritation, and other skin conditions. The transepidermal water loss measurement is often considered when developing skincare products or treatments aimed at enhancing the skin's barrier, ensuring optimal moisture levels, and maintaining overall skin health. Understanding TEWL helps professionals assess skin conditions and recommend appropriate products that can help reinforce the skin barrier, thereby minimizing water loss and maintaining hydration.