Angioedema is a swelling, similar to hives, but the swelling is beneath the skin rather than on the surface. Hives are often called welts. They are a surface swelling. It is also possible to have angioedema without hives.
See also:
Angioneurotic edema; Welts
Angioedema may be caused by an allergic reaction. During the reaction, histamine and other chemicals are released into the...
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Source: ADAM Encyclopedia
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Source: eOrthopod
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