Louisiana Cosmetology Board Practice Exam 2026 - Free Cosmetology Practice Questions and Study Guide

The proper pH range for skin is considered to be from 4.5 to 5.5. This slightly acidic pH is essential for maintaining the skin's barrier function, which protects against environmental stressors and pathogenic infections while keeping skin hydrated.

The skin's natural acidity helps in the prevention of bacterial growth and supports the efficacy of beneficial microbes that contribute to skin health. A pH below this range can indicate excessive acidity, which might lead to irritation or conditions such as dermatitis, while a pH above this range can signify alkaline conditions that may strip the skin of its natural oils, leading to dryness and increased vulnerability to irritation.

Maintaining a balanced pH is crucial for overall skin health, influencing processes like oil production, moisture retention, and the skin's immune response. This is why the range of 4.5 to 5.5 is widely recognized as optimal for healthy skin.