Eczema is a disease that causes the inflammation of the skin, which is usually characterized by itching, redness, and the appearance of oozing vascular lesions. Eczema is a non-contagious disease that usually causes the body to react to something it senses as an irritant. For instance, eczema may break out on your skin just as a result of your body's reaction to a certain kind of soaps or detergents which you are using at that particular time.
Psoriasis, on the other hand, is a non-contagious disease that usually causes the appearance of silvery flaky patches on the skin. These flaky patches on the skin can cause the inflammation of that spot, and it can also result in bleeding when scratched. Although both diseases are capable of damaging the skin, however, the effect of psoriasis can also be felt on the joints.
Also, while you can easily prevent eczema by preventing your body against irritants, psoriasis cannot be easily prevented in the same manner.