What is the term for an itchy, swollen lesion that lasts only a few hours?

Wheal is the term used to describe an itchy, swollen lesion that typically appears suddenly and can resolve within a few hours. It is often associated with allergic reactions, insect bites, or conditions such as urticaria (hives). Wheals are characterized by their raised appearance and can be quite itchy, making them distinguishable from other skin lesions.

Understanding the nature of wheals helps in recognizing their symptoms and potential causes, which can include a variety of irritants or allergens. The transient duration of these lesions, often resolving quickly, is a key trait that sets them apart from other types of skin conditions. This transient nature is also significant as it indicates the body's immediate response to a triggering factor, emphasizing the role of the immune system in such reactions.