What are Hives in Skin?
Hives, also known as urticaria, are itchy, raised welts or bumps that appear on the skin. They vary in size, ranging from small spots to large blotches. This skin reaction is often a result of an allergic reaction or other triggers.
Hives are characterized by:
- Raised, itchy welts: These welts are often red or pink, but can also be flesh-colored.
- Variable size and shape: They can appear as small spots or large, irregularly shaped blotches.
- Location: Hives can develop anywhere on the body.
- Triggers: Many things can trigger hives, including foods, medications, insect bites, pollen, and even stress. Sometimes, a cause cannot be identified.
According to the Mayo Clinic and other sources (Mayo Clinic, NHS, Cleveland Clinic), hives are a common skin reaction. The American Academy of Allergy, Asthma & Immunology (AAAAI) points out that they often begin as an itchy patch before turning into the characteristic swollen, red welts. The reaction is frequently caused by the release of histamine in the body in response to a trigger.
Common Causes of Hives:
- Allergic Reactions: Foods (like nuts, shellfish, or eggs), medications, and insect stings are frequent culprits.
- Physical Triggers: Heat, cold, pressure, sunlight, or even exercise can induce hives in some individuals.
- Infections: Viral or bacterial infections can sometimes trigger hives.
- Underlying Medical Conditions: Certain autoimmune diseases and other health problems may be associated with hives.
- Stress: Emotional stress can play a role in the development of hives.
The NHS and other sources emphasize that while hives are usually harmless, they can be uncomfortable and sometimes a sign of a more serious underlying condition, especially if accompanied by difficulty breathing.
