Psoriasis: Dissemination & inheritance

Psoriasis is a disease, since ancient times is known. A distinguished from other diseases and the description as a separate disease but were only about 150 years. The psoriasis is distributed worldwide, but there are significant regional differences: People Euro-Caucasian descent are most commonly affected (1-3% of the population), Asia-roots, people are less frequent, people with African origin rarely affected. For natives of the Americas, the psoriasis is not as good as before.