Psoriasis Psoriasis is a chronic relapsing hereditary, systemic inflammatory disease that affects mainly the skin and its accessory structures.

Psoriasis affects both sexes with the same frequency, occurs at any age, but especially around the 20th and 60th year of age.

It affects about 2% of the population. In psoriasis the skin cells multiply in a much faster rate than normal and that's why they add up and create the psoriatic plaques.