RESUMEN
Psoriasis is a chronic inflammatory skin disease often benign, affecting 2-3% of the total world population. Psoriasis is a multifactorial disease. To present recent advances in the immunologic mechanisms and susceptibility genes involved in the pathogenesis of psoriasis. We presented a literature review of recent genetic and immunological basis of psoriasis to better understand the pathomecanisms of this disease and discuss the contribution of the Tunisian work in this area. Recent works focalized mainly in immunology and genetics. Current progresses in molecular biology have allowed to better characterize the immunogenetic abnormalities in psoriasis. Psoriasis is a multifactorial disease model in which environmental factors [psychological, climate, traumatic, infectious, and viral] seem to be triggering factors when associated with a particular immunogenetics predisposition