Subsepsis allergica's main characteristics are high intermittent fever, irregular recurring exanthemata of different types, neutrophil leukocytosis, increased sedimentation rate, negative culture, no demonstrable cause and good prognosis. This disease usually oecurs in children under age of fifteen. We had opportunity to observe a case in 30 year-old fernale presenting most of the above mentioned charactristics and presumably belonging to this disease entity. Other fever producing diseases were excluded by clinical featuree, serologic tests and skin biopsy. It was treated by antibiotics and salicylate without effect, but it responded to corticosteroid.