Urticaria, also known as hives, is an outbreak of pale red bumps or welts on the skin that appear suddenly. The swelling that often comes with hives is called angioedema. Allergic reactions ...

Hives are swollen, pale red bumps ... making it hard to breathe. Allergic reactions, chemicals in foods, insect stings, sunlight, and medicines can make your body release a chemical called ...

A doctor may also perform blood tests or skin tests to find out what may have caused your hives — especially if your hives were the result of an allergic reaction. You may not need prescription ...

There are many other types of rashes with a wide variety of causes. Treatment for a rash requires the correct diagnosis and ...

Discover commonly overlooked causes of allergic reactions and rashes, from hidden household allergens to unexpected food ...

The symptoms of drug-induced skin reactions can range from a mild itchy rash to more serious reactions, such as widespread blistering or anaphylaxis. Skin reactions may appear right away after ...

A chemical rash often resembles a burn. It may present with swelling or blistering, or have oval-shaped flaky or dry patches. The allergic reaction is usually limited to the area of the skin that ...

Skin reactions can be alarming, especially when they appear suddenly. Many people struggle to tell the difference between hives and a rash, but knowing the cause is the first step toward relief.

Skin rashes, after all, can have many different shapes, sizes, and colors—and they have many possible causes too. Often, though, a rash can point to an allergic reaction, which occurs when your ...

However, not all rashes are hives. "Rashes occur on the skin as a result of a compromised skin barrier, drug reactions, viral illness, contact dermatitis, and many more," says board-certified ...