Psoriasis is a skin problem that affects two to three percent of the population. It can be very mild with only a few scaly patches on the scalp, arms, legs, or body, or it can become very widespread and severe. People are born with a genetic predisposition to get psoriasis. In childhood, certain infections such as Strep throat can trigger psoriasis.
Rarely, psoriasis can become so extensive or severe that hospitalization is required.
