New Jersey State Board Esthetics Practice Exam

What is the primary function of the acid mantle?

1. Protect skin from UV damage

2. Maintain skin hydration

3. Act as a barrier to bacteria

4. Stimulate collagen production

The correct answer is: Act as a barrier to bacteria

The primary function of the acid mantle is to act as a barrier to bacteria. The acid mantle is a thin film of fatty acids and lactic acid that sits on the surface of the skin. This mantle plays a crucial role in maintaining the skin's overall health by providing a defense mechanism against harmful microorganisms. By creating a slightly acidic environment, the acid mantle helps to inhibit the growth of pathogenic bacteria and fungi, thereby reducing the risk of infections and skin irritations. This protective barrier is essential for maintaining the skin's integrity and ensuring that it functions correctly as the body's first line of defense. While the acid mantle does contribute to other aspects of skin health, such as influencing hydration levels and providing some degree of protection from environmental factors, its most critical role is as a barrier against bacteria and other pathogens. This function underscores the importance of maintaining the skin's acid mantle—disruption of this layer can lead to various skin issues, including acne and dermatitis.