“…Few case reports of contact dermatitis, 4‐6 bullous delayed hypersensitivity and Stevens–Johnson syndrome or toxic epidermal necrosis related to NSO have been published 7,8 . To date, only one case of drug reaction with eosinophilia and systemic symptoms (DRESS), a delayed T‐cell adverse drug reaction, after application of NSO has been reported 9 . We report here a case of DRESS after application of NSO confirmed by positive patch test.…”