As shown in Figure 1, the serum level of IL-17F (Figure 1(b)  20.35 ± 20.66 versus 9.56 ± 3.20, P = 0.001) was significantly higher in pSS patients comparing to healthy controls, while serum level of IL-17A (Figure 1(a)  10.37 ± 3.95 versus 10.29 ± 1.87, P = 0.05) did not show statistical significance in the two groups. Here, IL17F is linked to peeling skin syndrome.