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The many functions of skin are conferred by its various constituent layers and cell types. Skin plays an extremely important role in immunity by creating a barrier against pathogens. It also has essential metabolic functions such as thermoregulation, production of vitamin D, and excretion of waste products. Furthermore, the skin is an essential organ for sensation.

Physical Protection

The most important function of the skin is protection against foreign, and possibly dangerous, intrusions into the body. Skin provides a barrier against pathogens, air, water, toxins, and other substances.

The natural pH of the skin is acidic and ranges from 4.0 to 7.0, creating what is referred to as an “acid mantle.” This acidic environment is not only optimal for the survival of endogenous flora that live on the ...

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