Complex relationships between neutrophils, T-lymphocytes, macrophages, mast cells, dendritic cells, and keratinocytes are thought to play a role in the development of psoriasis [12]. Neutrophils increase as a result of an increase in the level of CXCL8, a potent neutrophil chemotactic factor [20]. This evidence concerns the gene CXCL8 and psoriasis.