Hives, or urticaria, are itchy, raised welts that can appear pink, red, or flesh-colored. On darker skin, they may look slightly lighter or darker than the surrounding area. Though sometimes painful or stinging, hives are usually caused by allergic reactions to foods, medications, or environmental factors.

Hives can be acute (temporary) or chronic (persistent). Acute cases often resolve with allergy medications, while chronic hives or severe reactions need medical attention. When exposed to allergens, the body releases histamines, leading to swelling, itching, and rashes. Common triggers include pollen, food, medications, animal dander, and insect bites. Stress, infections, exercise, and temperature changes can also cause hives.

People with allergies or certain health conditions are more prone to developing them. Chronic hives can cause intense itching, welts of various sizes, and swelling around the eyes, cheeks, or lips. A doctor can diagnose and recommend treatments to relieve symptoms.