Psoriasis is characterized by the dermal and systemic secretion of certain pro-inflammatory cytokines of the Th1 and Th17 cytokine family, such as interferon-γ (IFN-γ), tumor necrosis factor (TNF), interleukin (IL)-6, IL-17, IL-22, and IL-23 [9]. This evidence concerns the gene IL22 and psoriasis.