Hives can develop when the body reacts to an allergen. When an allergic reaction occurs, the body releases a protein called histamine. Next, tiny blood vessels called capillaries leak fluid. This fluid accumulates in the skin and causes inflammation and a rash. As fluid accumulates under the skin, small bumps form.
The reaction can occur if a person consumes something or touches something that they are allergic to. This is known as “contact urticaria.”
If acute hives results from an allergic reaction, the cause may be:
- a medication, such as:
- some antibiotics
- some nonsteroidal anti-inflammatory drugs, or NSAIDs, such as aspirin
- angiotensin converting enzyme inhibitors, which are drugs for high blood pressure
- nuts, eggs, seafood, or another food allergen
- latex
- kiwi, banana, chestnuts, or mango, in people with a latex allergy
- some plants, including nettles, poison ivy, and poison oak
- additives in some foods, cosmetics, and other products
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