Oregon Esthetician State Board

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What is the average pH level of the acid mantle of the skin?

The correct answer is: 5.5

The average pH level of the acid mantle of the skin is generally recognized as around 5.5. This slight acidity is crucial for maintaining the skin's barrier function and overall health. The acid mantle is a thin film of fatty acids and lactic acid that provides a first line of defense against bacteria, viruses, and environmental pollutants. A pH of 5.5 enables the skin to function effectively and promotes the growth of beneficial microorganisms while inhibiting harmful ones. Moreover, when the skin's pH deviates significantly from this level, it can lead to various skin issues, such as dryness, irritation, or even infections. Maintaining the optimal pH balance of 5.5 is essential for healthy skin, as it helps to keep the enzymes in the skin functioning properly and supports the overall ecosystem of skin flora.