Wheal
1. [noun] a circumscribed, evanescent papule or irregular plaque of edema of the skin, appearing as an urticarial lesion, slightly reddened, often changing in size and shape and extending to adjacent areas, and usually accompanied by intense itching; produced by intradermal injection or test, or by exposure to allergenic substances in those susceptible. Synonym(s): hives, welt. [Medical Dictionary for the Health Professions and Nursing © Farlex 2012]
Source: http://medical-dictionary.thefreedictionary.com/wheal
Frequently Asked Questions
How might everyday exposure to allergens trigger a transient raised wheal on the foot during a simple walk?
When the foot comes into contact with common allergens, such as grass or pollen, it can develop a brief, raised area that changes shape. This wheal appears as a sign of an allergic reaction and typically resolves quickly, reflecting a dynamic skin response.
In what ways does a wheal on the foot differ from long-lasting skin marks like bruises?
A wheal on the foot is a temporary, edema-induced bump that can rapidly change in size and shape, while bruises remain static with color changes over time. This distinction helps clarify misconceptions about their differing underlying mechanisms and duration.