Dapsone is increasingly used in the treatment of rheumatic diseases. I
t is indicated in many inflammatory skin conditions characterized by p
olymorphonuclear cell infiltration. Minor reactions to the drug are ve
ry common, but severe idiosyncratic reactions are rare considering the
large number of patients taking this drug worldwide. We describe 2 pa
tients with cutaneous lupus erythematosus who developed severe dapsone
reaction after low dose therapy, with a fatal outcome in one, Physici
ans should be aware of the potentially lethal side effects of dapsone.