Not an infection (?). Fever and a rash. Biopsy makes the diagnosis. It is an infiltrate of the skin by PMN's.
Half of patients have an underlying, usually hematologic, malignancy. The rest are idiopathic.
Steroids AFTER the biopsy.
Curiously, it can occur during neutropenia, just where those white cells are coming from, I haven't figured out.
ICD9 Codes (Soon to be supplanted by ICD10)
Sweet's syndrome 695.89.