About our Skin
To understand what eczema is and what causes it, it helps to know something about the differences between healthy skin and skin affected by eczema.
Our skin provides a strong, effective barrier that protects the body from infection or irritation.  Skin is made up of a thin outer layer, a fairly elastic one in the middle, and a fatty layer at the deepest level. Each layer contains skin cells, water and fats, all of which help maintain and protect the condition of the skin.
Healthy skin cells are plumped up with water, forming a protective barrier against damage and infection. Fats and oils in the skin help retain moisture, maintain body temperature and also prevent harmful substances or bacteria from entering our bodies.
One way of picturing the way your skin works is by thinking of it as a brick wall. The outer skin cells are the bricks, while fats and oils act as the mortar that keeps everything together and acts as a seal. The skin cells attract and keep water inside, and the fats and oils also help keep the water in.
If you have eczema, your skin may not produce as much fats and oils as other people’s, and will be less  able to retain water. The protective barrier is therefore not as good as it should be. Gaps open up between the skin cells because they are not sufficiently plumped up with water. Moisture is then lost from the deeper layers of the skin, allowing bacteria or irritants to pass through more easily. Some everyday substances contribute to breaking down the skin. Soap, bubble bath and washing-up liquid, for example, will remove oil from anyone’s skin, but if you have eczema your skin breaks down more easily, quickly becoming irritated, cracked and inflamed.
Because it is prone to drying out and is easily damaged, skin with eczema is more liable to become red and inflamed on contact with substances that are known to irritate or cause an allergic reaction
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