Itchy raised welts that move around
A raised welt shows up on your arm. It itches, and it may sting. An hour later it is gone, and a new one sits on your leg.
That moving pattern is the mark of hives. Each welt is fluid that has leaked into the skin. Most fade within a day, then fresh ones pop up somewhere else.
Skin cells let out a chemical called histamine, and welts follow. Heat, sweat, tight clothes, scratching, some foods and some drugs can set this off. Often no clear cause shows up, and the welts keep coming back for weeks or months.
When to see someone
Call for emergency help if your lips, tongue, or throat swell. Do the same for hard breathing, a tight chest, or feeling faint. See a doctor for fever, joint pain, welts that last more than six weeks, or a single welt that stays in one spot for a full day, burns more than it itches, or leaves a bruise.
Below are remedies that people have long used for hives. Each one carries a grade that shows how much research has been done, not a promise of results. Talk with your doctor before you try any of them, above all if you take other medicine.



