Skin pH is a topic of interest not only in the cosmetic industry but also has clinical significance due to the important functions of the stratum corneum. There is a strong body of basic scientific evidence that skin pH is an important factor in skin homeostasis, integrity and antimicrobial protection. Many skin disorders are characterized by abnormal skin pH.

The skin is a very important organ, because it is a protective barrier between the body and the outside world. In particular, pH affects the health and function of the skin. However, some factors can directly affect the pH of the skin, causing the pH value on the skin to change temporarily such as when washing the face, contact with water or other skin care products.