Wheal

Wheal is a term used in medicine to describe a round or oval-shaped skin elevation, which is often itchy and transient. It is a common symptom of urticaria, also known as hives, and is caused by the release of histamine and other inflammatory mediators into the dermis.

Causes

Wheals can be caused by a variety of factors, including:

• Allergies: This is the most common cause of wheals. Allergens can include foods, medications, insect bites, and latex.
• Physical urticaria: This is a type of urticaria caused by physical stimuli such as pressure, cold, heat, sunlight, or water.
• Autoimmune diseases: Some autoimmune diseases, such as lupus and rheumatoid arthritis, can cause wheals.
• Infections: Certain infections, including bacterial infections, viral infections, and fungal infections, can cause wheals.

Symptoms

The main symptom of a wheal is a raised, itchy patch of skin. The skin may also be red or pink. Wheals can appear anywhere on the body and can vary in size. They usually disappear within 24 hours, but new wheals may appear as old ones fade.

Treatment

Treatment for wheals typically involves addressing the underlying cause. This may include avoiding allergens, treating infections, or managing autoimmune diseases. Medications such as antihistamines can also be used to relieve symptoms.

See also

• Dermatology
• Skin lesion
• Rash