Hives are raised red bumps on the skin most often caused by an allergic reaction. Hives usually cause itching, but may also burn or sting. They can appear anywhere on the body, including the face, lips, tongue, throat, or ears. Hives vary in size (from the size of a pencil eraser to that of a dinner plate), and may join together to form larger areas known as plaques. Occasionally, hives can signal more serious problems, especially when accompanied by symptoms such as difficult breathing. Follow the links below to find WebMD's comprehensive coverage of hives, what they look like, how to treat them, and much more.
Allergic Reactions to Insect Stings
Learn more from WebMD about mild to severe allergic reactions to insect stings and how to treat them.
Skin Conditions in Pregnancy
Learn about common skin conditions linked to pregnancy and what you can do about them.
Allergies Triggered by Cosmetics
Chances are good that you are allergic to certain cosmetics. WebMD explains the symptoms.
The Basics of Anaphylaxis
Anaphylaxis is a dangerous allergic reaction. Learn more about anaphylaxis.
Slideshows & Images
Picture of Hives (urticaria)
Urticaria, also known as hives, is an outbreak of swollen, pale red bumps or plaques (wheals) on the skin that appear suddenly -- either as a result of the body's adverse reaction to certain allergens, or for unknown reasons.
Images of Childhood Skin Problems
Hives, ringworm, warts: just a few skin conditions often seen in babies and children. How can you recognize these common childhood conditions -- and is home treatment possible?
Itches, Rashes, Bumps and Other Adult Skin Problems
Is your skin itching, breaking out, covered in a rash, or playing host to spots of some sort? It may be the result of infection, a chronic skin condition, or contact with an allergen or irritant. Learn to spot skin problems commonly seen in adults.
Picture of Urticaria
Urticaria. Wheals with white-to-light-pink color centrally and peripheral erythema in a close-up view. These are the classic lesions of urticaria. It is characteristic that they are transient and highly pruritic.