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Abstract:  Painful erythematous plaques and a pathognomonic, dense, dermal infiltrate of neutrophils characterize Sweet syndrome. Although numerous instances of this disease have been reported in children, only four have had an associated immunodeficiency to date. Sweet syndrome has been traditionally treated with systemic corticosteroids despite an unknown pathogenesis. Prior reports suggest that immunodeficient children with Sweet syndrome may have a persistent course and fail to respond to standard treatment. We describe a child with debilitating Sweet syndrome and a primary immunodeficiency whose symptoms were controlled with intravenous immunoglobulin and dapsone.