Psoriasis is a skin condition triggered by an abnormality in the immune system. As an effect of that abnormality, Psoriasis becomes present in the body.
The abnormality mentioned happens in the changing and replacement of the outer skin cells. A person with a normal immune system and skin will normally have their outer skin cells replaced in three to four weeks or 21 to 28 days. However, Psoriasis patients are having their skin cells replaced in a matter of two to six days. The fast cycle of skin replacement is the Psoriasis people see.

Because of this fast and abnormal skin cell replacement, Psoriasis becomes very obvious because it is on the surface of the skin. How Psoriasis looks like varies according to severity. Usually it is dry, flaky, red and itchy patches of the skin with scaling that is commonly silvery or whitish. The red patches of the dry skin are blood vessels that are increased to aid the cell regeneration that happens in a fast phase. The scaling is the accumulation of the skin cells. The size and shape of Psoriasis differs from one person to the other and even from one part of the body to another.