The acid mantle is a mixture of Sweat and Sebum on the surface of the skin. Skins normal pH is about 4 to 5.5, this mixture which is acidic is called acid mantle.
The acid mantle protects the skin from bacteria. If you strip the skin of its acidic mantle by using strong alkaline soaps or cleansers, bacteria will find it easy to attack the skin. Removing the acid mantle disturbs the distribution of dead cells on top of the epidermis. This is called stratum corneum.
The skin is a miracle. These dead cells if allowed to accumulate will make the skin look very bad, but if completely removed, the skin is left defenseless to an extent. We have to keep a fine balance in maintenance of the skin.
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