soriasis is a chronic lifelong inflammatory dermatosis related to an anomaly of the proliferation and the differentiation of epidermal cells. Its first description dates back to 1808 by the British Robert William in his treatise of skin diseases. This affection concerns 1-3% of the world population, irrespective of gender. It is associated with high degree of morbidity and poor quality of life, and thus leads to a major impact on health care systems and on the society in general.
While the precise cause of the disease is still imperfectly known, there have been major advances in understanding its aetiopathogenesis, thus resulting in a remarkable increase of more targeted therapeutic resources such as biotherapies. Nevertheless, there are still many questions which remain unanswered and suspected associations between psoriasis and specific ethnic groups deserve to be studied, since they may lead to a better knowledge of genetic and/or environmental factors that could be involved in the aetiopathogenesis of this disease.