When hives occur on only one part of the body, it might be due to contact with an irritant. Plants, pollen, food, household products or animal saliva are common examples.
To alleviate the effects, wash the allergic substance from the skin with soap and water. If itching occurs, apply a cold compress for 20 minutes.
Hives located on one part of the body should disappear on their own within a few hours.
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