The diagnosis of urticaria and angioedema is always dependent upon a detailed history that elicits a description of the hives or swelling, including the items listed below:
1. How long has urticaria or angioedema been present? 2. What is the shape and size of the lesions-circular, linear, serpiginous,
or other shapes? Is the lesion a few millimeters in diameter, the size of a dime, nickel, quarter, or half-dollar, or are there giant hives that are 3 in. or more in diameter?