TNF and palmoplantar pustulosis: We also carried out a sub-analysis with the data of skin biopsies from six patients with immune-mediated diseases (uveitis [N = 1], Crohn’s disease [CD, N = 3], and rheumatoid arthritis [RA, N = 2]) who had developed a PPP induced by anti-TNF drugs (2 infliximab, 1 adalimumab, 1 etanercept, 1 certolizumab pegol, 1 golimumab).