The natural barrier of the skin that helps protect against moisture loss and infection is called the

• A. Acid mantle
• B. Epidermal layer
• C. Dermal fascia
• D. Subcutaneous tissue

Answer: (A)

The skin’s barrier is not just a physical outer layer but a chemical shield on the surface. This shield, the acid mantle, is formed by sweat and sebum and keeps the skin slightly acidic. That acidity helps inhibit many microbes and reduces water loss, protecting against infection and dehydration. The epidermal layer refers to the actual skin cells beneath, while dermal fascia and subcutaneous tissue are deeper tissues; they don’t function as the surface barrier that prevents moisture loss and infection. So the acid mantle is the best term for this protective surface film.