New Jersey Esthetics Practice Exam 2025 – Complete Test Prep

The acid mantle is a vital component of the skin's barrier function, primarily composed of a thin film of fatty acids and lactic acid. This protective layer plays an essential role in maintaining skin health by keeping the skin slightly acidic, which is important for several reasons.

The typical pH range of the acid mantle is from 4.5 to 5.5. This mildly acidic environment helps inhibit the growth of harmful bacteria and fungi, which prefer more neutral to alkaline conditions. Additionally, the acid mantle aids in the prevention of transepidermal water loss, thus maintaining hydration and elasticity of the skin.

Options that fall outside of the 4.5 to 5.5 range do not accurately represent the optimal pH level needed for the acid mantle to function correctly. A pH lower than 4.5 could be too acidic and potentially harmful, while a pH above 5.5 could compromise the effectiveness of the acid mantle, leading to an increased risk of infection, irritation, and other skin issues. By maintaining a pH in the range of 4.5 to 5.5, the skin can better protect itself and maintain its overall health.