To the Editor: Dapsone hypersensitivity syndrome (DHS) is a dapsone-induced T–cell mediated delayed type of hypersensitivity, characterized by fever, rash, lymphadenopathy, and hepatic function abnormalities. 1 Richardus J.H. Smith T.C. Increased incidence in leprosy of hypersensitivity reactions to dapsone after introduction of multidrug therapy. Lepr Rev. 1989; 60: 267-273 The diagnosis of DHS is traditionally based on the criteria proposed by Richardus and Smith.