What are etiologies for urticaria?

• Acute urticaria is sometimes due to allergy. Allergy depends on previous exposure to the material, and the development of an immune reaction to it • IgE is involved, which attaches itself to a receptor on the mast cell and causes it to release its chemical mediators Causes of acute allergic urticaria • Drug eruption: most often an antibiotic, but many other drugs have been reported as well as vaccines • Food allergy: tiny amounts of fish, eggs, nuts and kiwifruit (many others have been reported less often) • Bee or wasp stings • While most allergies involve ingestion, injection or inhalation of the allergen, sometimes allergic urticaria can result from skin or mucosal contact with an allergen (rubber, latex)