Thick, scaly patches appearing on your skin? It's psoriasis

Psoriasis forms well-defined, thick and scaly patches that can appear on any part of your body.

I have never had any skin problems before in all my life. Then I was put on a beta-blocker drug and one of the side effects I got was some patches on my body and scalp. The doctor said it was psoriasis. What is that?

Psoriasis is actually a common skin condition.