His whole body was itchy, he thought it was an allergy and was diagnosed | April 19, 2025

Why do hives appear on the skin? These are the surprising facts you might not know.
Hives, or known as urticaria, are itchy, raised welts that are found on the skin. They’re usually pink, red, or flesh colored on lighter skin and may be flesh colored or slightly lighter or darker than your skin tone on brown or black skin.

At times they sting or hurt. In the majority of cases, hives are caused by an allergic reaction to a medication or food or are a reaction to an irritant in the environment.

In many cases, hives are an acute (temporary) problem that may be alleviated with allergy medications. Most rashes go away on their own. However, chronic (ongoing) cases, as well as hives accompanied by a severe allergic reaction, are larger medical concerns.

What causes hives?

Hives are usually caused by an allergic reaction to something that you have encountered or swallowed. When you have an allergic reaction, your body begins to release histamines into your blood. Histamines are chemicals your body produces in an attempt to defend itself against infection and other outside intruders.

In some people, histamines can cause swelling, itching, and many of the symptoms that are experienced with hives. In terms of allergens, hives can be causedTrusted Source by factors such as pollen, medications, food, animal dander, and insect bites.
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