A wheal or wheal response (also terme a welt) is a firm, elevated, rounded or flat topped,, generally pale red papule or plaque swellings of the skin. They are usually well demarcated and may be round, oval, gyrate, annular or irregular/serpiginous with pseudopods in shape. They often itch or have a burning sensation but are transient, typically disappearing within 24-48 hours.