Introduction:Omenn syndrome, a variant of severe combined immunodeficiency disorder, is a rare condition, with few cases reported in literature. Case Characteristics: A three month old female infant presented with recurrent severe infections, chronic diarrhea, severe erythroderma and lymphadenopathy. Immunological work-up revealed agammaglobulinemia, with both B cell and T cell deficiency. Genetic studies were compatible with Omenn syndrome. Outcome: Bone marrow transplantation was planned, but the infant succumbed to complications. Message: In a young infant with recurrent severe infections, characteristic skin lesions and combined immunodeficiency, Omenn syndrome should be suspected.