some nonsteroidal anti-inflammatory drugs, such as aspirin.If acute hives results from an allergic reaction, the cause may be: The reaction can occur if a person consumes something or touches something that they have an allergy to. As fluid accumulates under the skin, small bumps form. This fluid accumulates in the skin and causes inflammation and a rash.
Next, tiny blood vessels called capillaries leak fluid. When an allergic reaction occurs, the body releases a protein known as histamine. Hives can develop when the body reacts to an allergen.
However, they can develop as a reaction to: Allergens Sometimes there is no clear reason why hives occur.
