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Urticaria:
a vascular reaction of the skin marked by the transient appearance of smooth, slightly elevated patches (wheals) which are redder or paler than the surrounding skin and often attended by severe itching. Also called hives.
Vascular:
pertaining to blood vessels or indicative of a rich blood supply.
Vasoconstriction:
diminution of the diameter of vessels, especially arterioles, leading to decreased blood flow to a part.
Vasodilation:
widening (dilation) of a vessel, especially arterioles, leading to increased blood flow to a part.
Venom:
a toxic substance normally secreted by a snake, insect or other animal.
Wheal:
a smooth, slightly elevated area on the body surface, which is redder or paler than the surrounding skin; it is often itchy and is the skin manifestation of allergy.
Wheeze:
an abnormal whistling sound made in breathing, particularly in asthma.
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