Further quantitative RT-PCR confirmed that topical ozone therapy could significantly inhibit the expression of many chemokines, such as C-X-C motif ligand (CXCL) 1, CXCL2, and CXCL3, and psoriasis-associated inflammatory factors, including IL-17a, IL-17c, IL-17f, IL-1β, IL-8, IL-22, TNF-α, vascular endothelial growth factor (VEGF), defensin B14, S100A7, S100A8, and S100A9 (Figure 3f). This evidence concerns the gene S100A9 and psoriasis.