In a healthy body, mast cells (the “lookout” cells of the immune system) only release histamine when they detect a foreign invader, like pollen or venom. In CSU, these cells dump histamine into the ...

Medically reviewed by Katlein Franca, MD Doctors use a process of elimination to diagnose chronic hives, rather than a single test.The diagnostic process involves determining how long the hives have ...

Hives (urticaria) are a common skin reaction that causes bumps, raised patches, or both. They are one way the body responds to an allergen or trigger. Reactions can be uncomfortable but aren’t ...

Hives, or urticaria, are a common skin rash that appears as raised, itchy welts. Sometimes, hives resolve quickly on their own, but if they persist, over-the-counter medications often help. Hives ...

(BPT) – If you’ve had hives, you know how challenging they can be. But you may not know that there is more than one type of hives, or urticaria, and that treatments are available. A brief episode of ...

Your child's doctor can help, but one of the biggest clues is itchiness. Since your baby or toddler won't be able to tell you how they're feeling, you'll need to watch for scratching behavior. It's ...

Xolair (omalizumab) is a prescription drug used to treat chronic (ongoing) hives without a known cause. Xolair is a biologic drug and does not come in a biosimilar version. It’s used when symptoms ...

If you notice red, itchy welts suddenly popping up on your skin, you may start to panic. Are you having an allergic reaction? Did you catch something contagious? But your mystery rash may have a much ...

There are many different types of hives -- urticaria -- with many different causes. In most cases, these puffy, red, or skin-colored bumps and wheals appear suddenly due to an allergic reaction to ...

Hives, or urticaria, can occur for many reasons, such as exposure to an allergen or a physical trigger, like pressure from tight clothing. It may also indicate an infection or another underlying ...