Clinical and immunological characteristics of the patients selected for skin biopsy.

Data are shown as mean±SD or absolute numbers.*The expression of IL-22 in the supernatants of stimulated PBMCs from every BD patient with erythema nodosum (n = 5) is higher than the normal range (792–981 pg/ml, 95% confidence interval for mean), the requency of IL-22-positive CD4+ T cells in PBMCs from BD patients with erythema nodosum (n = 4) is also higher than the normal range (0.86%–1.6%, 95% confidence interval for mean).