Your skins acid mantle is composed of sebum, dead skin cells, sweat, and a healthy microbiome - it should be slightly acidic, with a ph between 4.5-5.5, and these protective oils waterproof your skin and help keep the skin cells tight and flat, protecting you from the elements (heat and cold and water, and also from bacteria and other microbes that cause acne). I don’t believe there are different “skin types” so much as there are different ways peoples acid mantle is thrown off balance, which contribute to skin problems such as dry, red skin, acne, eczema, and oily skin. When your acid mantle is too acidic- you suffer from dry, scaly, cracked skin and allergies, and when its too alkaline, you tend to suffer from breakouts. Our acid mantle is damaged from over washing, harsh chemicals, tearing/removing the skin by exfoliating through scrubs and acids, and using hot water. We recommend following the “less is more” when it comes to cleansing, especially if you are just starting to repair your acid mantle.