Sweet's syndrome (SS) developed in two patients with acute myeloid leu
kaemia (AML) treated with granulocyte colony stimulating factor (G-CSF
) for febrile neutropenia due to AML chemotherapy. Fever, painful skin
and conjunctival lesions developed and neutrophilic infiltration was
detected at biopsy specimens. Neutrophilia was not detected. Skin lesi
ons regressed within 1-2 weeks and conjunctival lesions within 4 weeks
following the cessation of G-CSF. We conclude that SS may be a compli
cation of G-CSF therapy and tender skin and/or conjunctival lesions de
veloping during G-CSF therapy should suggest the possibility of SS.