Welt (medicine)
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In medicine, a welt is a section of skin which is raised. It can also be referred to as a "wheal". It may be caused by a blow or lash to the skin, by an allergic reaction, or by the injection of fluid via hypodermic syringe. If part of an allergic reaction, that itches intensely, it may be referred to as urticaria or hives.
The elevation of the skin is caused by an accumulation of fluid within the skin layer. This may or may not disappear over time.