PCNA and psoriasis: For the anti‐inflammatory and anti‐proliferation property, lower levels of p‐STAT3, p‐Akt and PCNA were observed in IMQ+NB group (Figure 4K,L, quantification results in Figure S9H,I, Supporting Information) as well as mRNA levels of psoriasis‐associated cytokines (Il‐6, Il‐1α, Il‐1β, Il‐17A, Il‐17F, Il‐22, Il‐23, Tnfα) (Figure 4M).