Psoriasis affects up to 7.5 million Americans, according to the National Institutes of Health. Psoriasis is more common in adults than children and affects males and females equally.
2% to 3% of people throughout the world
About 2.2% of people in the United States
Some cultures more than others. Worldwide, psoriasis is most common in Scandinavia and other parts of northern Europe. It appears to be far less common among Asians and is rare in Native Americans,...