What are hives and what causes them? Hives are a term used to describe a medical condition known as urticaria, a skin disorder that occurs when the body’s immune system responds to an allergic threat.

Medically reviewed by Susan Bard, MD Key Takeaways A pimple-like rash can be caused by many conditions like rosacea, ...

Hives are a common symptom of COVID-19 that can occur during the day or night. Hives only at night might be from something you’re coming into contact with in the evenings. COVID-19 can cause hives ...

When your body has an allergic reaction, it releases chemicals that can make your skin swell, causing those itchy, red bumps on your skin that's characteristic of hives. While certain foods and ...

Both bug bites and hives can cause red, itchy bumps on your skin. While it can be difficult to tell them apart, learning key features and characteristics of each can help. Hives and bug bites are ...

Identify triggers by taking notes about foods, medications, or environmental exposures like sunlight or allergens, then make a plan to avoid them. Soothe hives by applying topical anti-itch ...

This informational guide, part of PS's Condition Center, lays out the realities of this health concern: what it is, what it can look like, and strategies that medical experts say are proven to help.

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Poison ivy, fragrances, and medications are some common substances that can cause an allergic reaction rash. The rash may vary in size and severity, depending on its cause. A person can treat most ...

A common symptom of Lyme disease is a bullseye-shaped rash. However, many other conditions may cause a similar rash, including ringworm, fixed drug reactions, and allergic reactions to insect bites.

If you’ve developed a rash that’s hot, swollen, bumpy, or itchy, it’s possible you have hives. Finding hives on your skin can be unsettling, and usually you can’t be sure where they came from. No ...

Perioral dermatitis is a red rash that appears around your mouth and nose and causes red, inflamed, swollen bumps on the ...