What is the skin barrier?
The topmost layer of the skin (known as the strateum corneum) is made up of skin cells, lipids and natural moisturizers that are arranged in a lamellar structure. This structure forms the skin barrier that protects the deeper layers of the skin against the harmful effects of the environment. When the amount of lipids in the strateum corneum decreases, the skin barrier weakens. A loss of moisture in the skin can also cause dryness and itchiness. A weakened skin barrier can also cause substances to easily penetrate your skin, causing irritation, redness and itching.