Whats the differance in exzema and psorisis?

Different diseases: Eczema and psoriasis are two distinct hereditary skin diseases that usually differ in their appearance and location on the skin, but at times it can be difficult to clinically distinguish the two. Occasionally, a skin biopsy may be necessary to sort things out. In mild cases both tend to respond to topical steroid creams and ointments. More severe cases should be referred to a dermatologist.

Completely different: Eczema is primarily due to a broken skin barrier allowing the skin's water content to escape while opening the ways for allergens to enter . It is intensely itchy and often associated with asthma and hay fever. Psoriasis is caused by a different immune mechanism and usually shows overproduction of skin scales. It may or may not be itchy and often accompanied by arthritis.