Drug reaction with eosinophilia and systemic symptoms (DRESS) is a delayed, potentially life-threatening, hypersensitivity reaction characterized by a widespread, long-lasting skin eruption, fever, lymphadenopathy, hematological abnormalities, and organ involvement. Time to onset and course are relatively long; relapses may occur. Clinical and biological variability make DRESS a challenging diagnosis. Pathogenesis is not exactly known, but probably reflects a complex interplay of drug and viral-related factors in which genetics and abnormal metabolic pathways of drugs play an important role. Although associated with many drugs, DRESS is mainly observed after a limited number of “high risk” drugs. Early recognition, prompt withdrawal of the culprit, and treatment with corticosteroids are the mainstay of management.</p
