Wheal
Wheal
Wheal (/wiːl/), also known as a hive, is a temporary raised area on the skin that is often itchy and can be caused by an allergic reaction.
Etymology
The term "wheal" is derived from the Old English word "hweol" which means "wheel" or "circle". This is likely due to the round or oval shape of a wheal.
Definition
A wheal is a round or oval, itchy, and pale red bump on the skin. It is a common symptom of an allergic reaction and can appear within minutes of exposure to an allergen. Wheals can vary in size and may appear anywhere on the body. They are usually accompanied by other symptoms such as redness, swelling, and itching.
Causes
Wheals are caused by the release of histamine and other chemicals into the skin. This can occur as a result of an allergic reaction to substances such as foods, medications, insect bites, or exposure to heat, cold, or sunlight.
Related Terms
- Allergy: A hypersensitivity reaction to a particular allergen; symptoms can vary greatly in intensity.
- Histamine: A compound that is released by cells in response to injury and in allergic and inflammatory reactions, causing contraction of smooth muscle and dilation of capillaries.
- Urticaria: Also known as hives, a kind of skin rash with red, raised, itchy bumps.
- Angioedema: A condition characterized by deep swelling around the eyes and lips and sometimes of the genitals, hands, and feet.
External links
- Medical encyclopedia article on Wheal
- Wikipedia's article - Wheal
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