HMGB1 and toxic epidermal necrolysis: Serum total HMGB1 was not significantly elevated in patients with nevirapine‐induced SJS/TEN (3·98 ± 2·17 ng mL−1), MPE (3·92 ± 2·75 ng mL−1) or drug reaction with eosinophilia and systemic symptoms (4·73 ± 3·00 ng mL−1) vs. tolerant controls (2·97 ± 3·00 ng mL−1).