Wheals (raised areas surrounded by a red base) from urticaria can appear anywhere on the surface of the skin. Whether the trigger is allergic or not, a complex release of inflammatory mediators, including histamine from cutaneous mast cells, results in fluid leakage from superficial blood vessels. Wheals may be pinpoint in size, or several inches in diameter.
Angioedema is a related condition (also from allergic and nonallergic causes), though fluid leakage is from much deeper blood vessels in the subcutaneous or submucosal layers. Individual hives that are painful, last more than 24 hours, or leave a bruise as they heal are more likely to be a more serious condition called urticarial vasculitis. Hives caused by stroking the skin (often linear in appearance) are due to a benign condition called dermatographic urticaria.
Read more about this topic: Chronic Urticaria
Other articles related to "appearance":
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1990 "Return of the Warrior" 1 This episode marks the final brief appearance of Seymour ... This episode includes the second, and final, appearance of Jack Harry Teesdale 23 ... September 1990 "Walking Stiff Can Make You Famous" 1 Foggy invents bicycle polo 96 30 ... Features a guest appearance from Gorden Kaye as a TV announcer 28 ... October 1990 "Roll On" 2 Foggy invents the sport of barrel-rolling 4 ... November 1990 "A Landlady for Smiler" 2 Smiler ...
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Famous quotes containing the word appearance:
“Look into the worldhow often do you behold a sordid wretch, whose straight heart is open to no mans affliction, taking shelter behind an appearance of piety, and putting on the garb of religion, which none but the merciful and compassionate have a title to wear.”
—Laurence Sterne (17131768)
“Do not look on his appearance or on the height of his stature, because I have rejected him; for the LORD does not see as mortals see; they look on the outward appearance, but the LORD looks on the heart.”
—Bible: Hebrew, 1 Samuel 16:7.
“I think I am one of those who can manage not to take on a completely different appearance under their own glance.”
—Jean Rostand (18941977)