What is the reaction that occurs when one is allergic to iodine?

Allergic reactions to iodine contrast agents during medical procedures can vary in severity. Mild reactions may include redness, itching, and hives. These symptoms usually go away on their own. In rare cases, more serious reactions such as difficulty breathing or swelling can occur, but this is uncommon. It is important to inform your healthcare provider if you have any concerns about being allergic to iodine before undergoing any medical procedures involving iodine contrast agents.