The approximate pH of the skin is closest to which value?

The approximate pH of the skin is closest to which value?

• A. 5.5
• B. 4.5
• C. 6.5
• D. 7.5

Answer: (A)

The skin maintains a mildly acidic surface, known as the acid mantle, to support the barrier and deter microbes. Healthy skin is typically around pH 5.5, so the value closest to reality is 5.5. This slight acidity comes from sweat, sebum, and related organic acids on the skin surface, which help keep the barrier intact and microbiota balanced. Values like 4.5 are more acidic than usual, while 6.5 and 7.5 are closer to neutral or alkaline and not characteristic of normal skin.

The skin maintains a mildly acidic surface, known as the acid mantle, to support the barrier and deter microbes. Healthy skin is typically around pH 5.5, so the value closest to reality is 5.5. This slight acidity comes from sweat, sebum, and related organic acids on the skin surface, which help keep the barrier intact and microbiota balanced. Values like 4.5 are more acidic than usual, while 6.5 and 7.5 are closer to neutral or alkaline and not characteristic of normal skin.