What is psoriasis?
Psoriasis (say "suh-RY-uh-sus")
is a long-term (chronic) skin problem that causes skin cells to grow too
quickly, resulting in thick, white, silvery, or red patches of skin. Normally,
skin cells grow gradually and flake off about every 4 weeks. New skin cells
grow to replace the outer layers of the skin as they shed. But in psoriasis,
new skin cells move rapidly to the surface of the skin in days rather than
weeks. They build up and form thick patches called plaques (say "plax").