Facial Sweet syndrome mimicking photoallergic contact dermatitis.

Sweet syndrome (acute febrile neutrophilic dermatosis) usually presents with painful erythematous plaques, malaise, and fever. Histologically skin infiltration with neutrophils is characteristic. The etiology of the disease is unknown. Sweet syndrome can be subdivided into the classical form, which is usually idiopathic and is associated with some kind of inflammation, the paraneoplastic form and the drug-induced one. We present the unusual case of an 83-year-old woman who appeared to have facial photoallergic contact dermatitis but turned out to have facial Sweet syndrome.