Based on our numerical analysis, we suggest that increases in the level of cytokines IL-15, IL-17/IL-23 and \documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$$\hbox {TNF}_{\alpha }$$\end{document}TNFα would indeed lead to psoriasis but their routes would be different. This evidence concerns the gene IL17A and psoriasis.