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Stevens-Johnson syndrome (SJS) is a complex immunological syndrome with high morbidityand mortality and characterized by acute blistering affecting the skin and at least twomucous membranes.Macrophage activation syndrome (MAS) is a severe,potentially life-threatening syndrome that often occurs in children and adults with autoimmune disease,especially systemic-onset juvenile idiopathic arthritis or adult-onset Still s disease.This case report highlights the potential risks of SJS developing into MAS,and suggests that rapid diagnosis and treatment are essential to achieving favorable outcomes.