Abstract: A 2.5-month-old infant had Sweet syndrome. Chronic granulomatous disease was subsequently diagnosed by the nitroblue tetrazolium reduction test. To date, this infant is the youngest reported with Sweet syndrome. Moreover, the association of chronic granulomatous disease with this syndrome has not been previously described. The precise relationship between the conditions remains to be determined. Granulocyte function should be evaluated in any infant with Sweet syndrome.