California Cosmetology Practice Exam

Sebum is an oily substance produced by the sebaceous glands in the skin. Its primary role in skin health is to moisturize and protect the skin. By creating a thin, oily layer on the skin's surface, sebum helps to prevent moisture loss, which is crucial for maintaining hydration and elasticity in the skin. This barrier also provides a certain level of protection against external environmental factors, such as bacteria and pollutants, helping to keep the skin healthy.

In addition to its moisturizing properties, sebum plays an important role in maintaining the skin's pH balance. The slightly acidic nature of sebum contributes to the skin's acid mantle, which is vital for a healthy skin barrier. This balance supports the skin's natural flora and aids in preventing infections and inflammation.

Understanding the function of sebum is essential for anyone in the cosmetology field, as it directly impacts skin care practices and product formulations aimed at maintaining or restoring skin health.