What are causes of acute urticaria?

Acute urticaria that is more common in children, may appear early after exposure (perhaps minutes) and can last several weeks. For acute urticaria, ask about possible precipitants, such as the following: Foods, drugs, IV radiocontrast, travel, infection, perfumes, detergents, pets, Fire and stings, pregnancy, contact with latex, sun/cold exposure, exercise, alcohol (most common is food, meds, infections and latex) NOTE food could cause IgE mediated true allergy or non immunoliogical (pseudoallergens) should occur directly after eating (questionable after 3-6 hours Meds rarely cause IgE mediated (usually non-immuno) some do both mechanisms (Abx)