What sort of disorder is eczema?

The itch that rashes. We can think of eczema as having 2 main parts: something about affected skin that makes it easier for it to dry out/crack, and external or internal 'stuff' that further irritates and damages the skin. Hydration of the skin is the most important part of skincare for eczema (thick, goupy, greasy creams often work best right after bathing). Watch also for new chemicals/foods/etc that make it act up.