Acute urticaria: history and natural course of 50 cases.

Fifty patients with acute urticaria who visited within a week after the onset were interviewed and the history around the onset of urticaria was carefully taken. It was known that the majority of the patients had experienced some symptoms suggestive of infection. The patients were followed up for a year to determine the last efflorescence. It was disclosed that 43 cases were cured within two weeks and 5 other cases were cured between 2 weeks and 3 months. The remaining 2 cases persisted over a year. These results seem to suggest that urticaria is an immunologically erroneous reaction to foreign body innoculation, a large majority of which is acute infection.