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 ...

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

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 ...

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 ...

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

Allergic contact dermatitis has a characteristic red rash that feels very itchy. You may suspect this type of allergic reaction if you’ve recently used a new facial soap, lotion, or cosmetic and ...

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 ...

The symptoms of an allergic reaction differ depending on the trigger substance, otherwise known as an allergen. A person could develop a rash in one area after using face cream, while someone ...

A rash is defined as a widespread eruption of skin lesions. It is a very broad medical term. Rashes can vary widely in appearance. Their causes range from insect bites to HIV and reactions to ...

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.

and they could be a sign of a serious allergic reaction. Hives might not cause any discoloration on darker skin, so be alert for raised patches or welts—those could be a sign of urticaria.