In psoriasis plaques, non-significant trends of a higher infiltration of CD15+ neutrophil granulocytes (17.1 versus 8.9 positive cells per visual field, p = 0.5), BDCA-2+ plasmacytoid dendritic cells (6.3 versus 4.5, p = 0.3), and IL-17+ T cells (17.8 versus 10.0, p = 0.3) as compared to ACD reactions was observed. Here, IL17A is linked to psoriasis.