Sebum is a sticky, oily substance produced by the skin, and when the skin does not produce or hold enough natural oil it causes dry skin. This is not the only reason it may be due to the lack of water quantity in the body or washing your face frequently can cause dry skin. Dry skin can be itchy and scratchy or even can leave your complexion looking dull. Causes of dry skin There can be both external and internal factors that may cause dry skin , Cold or dry weather, harsh soaps, overbathing, and sun damage are some of the external factors that play a role in getting your skin dry. Internal factors may include your genetics and water content in the body. Aging also plays a vital role as the capacity of producing natural oil is reduced with the declining age which can be cured by keeping your skin moisturized and hydrated. Some common mistakes cause dry skin - Frequently wash your face. Exfoliate your skin too often. Rub your face too harshly while cleaning/wiping. Using the product wit...