wheal
elevated irregular-shaped area of cutaneous edema; solid, transient; variable diameter; examples are insect bites, urticaria, allergic reaction, lupus erythematosus
A wheal is a raised, red, itchy bump on the skin that is typically accompanied by some swelling. It is usually caused by an allergic reaction to an external stimulus, such as an insect bite, a medication, or a food allergen. When an allergen enters the body, it triggers the release of histamine and other chemicals, which cause the surrounding blood vessels to dilate and the surrounding skin to become inflamed, resulting in the formation of a wheal. Wheals are a common symptom of many allergic conditions, such as hives, angioedema, and allergic contact dermatitis. They usually clear up on their own within a few hours or days, but may require treatment with antihistamines or other medications if they are particularly uncomfortable or widespread.
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