As for extraskeletal features, presence of PPP and/or psoriasis was associated with higher ESR (median [IQR] 17(8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33) versus 11(6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20) mm/hr, p = 0.026), but this was not the case for CRP or SII. Here, CRP is linked to palmoplantar pustulosis.