A problem with your immune system causes psoriasis.

Stress may cause psoriasis to appear suddenly or make symptoms worse (although this has not been proven in studies).

The purpose of treatment is to slow the rapid growth of skin cells that causes psoriasis and to reduce inflammation.

"A strep infection will cause psoriasis to flare badly," he says.

Stress can cause psoriasis to appear suddenly (flare) or can make symptoms worse.

They block the action of the cells that cause psoriasis.

Infections such as strep throat can cause psoriasis to appear suddenly, especially in children.

But the point of the experiment was to determine whether these activated white blood cells were causing psoriasis.

No one knows exactly what causes psoriasis.

Character 1: Hey, did you hear that laundry detergent can cause fatal psoriasis?