C4A and peeling skin syndrome: In multivariate analysis, the independent predictive character for PN development in pSS patients was confirmed for NLR (95% CI 0.033 to 0.263, p = 0.012), MLR (95% CI −1.289 to −0.194, p = 0.008), gammaglobulins (95% CI −0.426 to −0.088, p < 0.003), complement fraction C4 (95% CI −0.018 to −0.001, p < 0.030) and vitamin D (95% CI −0.017 to −0.003, p < 0.009).