Hives Allergic Reaction

Hives – this is also known as urticaria. Contact dermatitis – this is also called short-term allergic reaction rash. There are also long-term allergic reaction rash and a rare syndrome called Stevens – Johnson syndrome. Symptoms of Allergic Reaction Rash. The symptoms will vary according to the type of allergic reaction rash you are having. Allergic reactions, chemicals in foods, insect stings, sunlight, and medicines can make your body release a chemical called histamine. Histamine sometimes makes blood plasma leak out of small blood vessels in the skin, causing hives or angioedema. Sometimes, doctors don’t know exactly why hives have formed.

Hives are red and sometimes itchy bumps on your skin. An to a drug or food usually causes them. Allergic reactions cause your body to release chemicals that can make your skin swell up in hives. People who have other allergies are more likely to get hives than other people. Other causes include infections and stress.Hives are very common. They usually go away on their own, but if you have a serious case, you might need medicine or a shot. In rare cases, hives can cause a dangerous swelling in your airways, making it hard to breathe - which is a medical emergency.

AngioedemaAngioedema may cause large welts below the surface of the skin, particularly on the eyes and lips. CausesThe welts that come with hives arise when certain cells release histamine and other chemicals into your bloodstream.Doctors often can't identify the reason for chronic hives or why acute hives sometimes turn into a long-term problem. The skin reaction may be triggered by:. Pain medications. Insects or parasites.

Infection. Scratching. Heat or cold. Stress. Sunlight.

Exercise. Alcohol or food. Pressure on the skin, as from a tight waistbandIn some cases, chronic hives may be related to an underlying illness, such as a thyroid disease or, rarely, cancer. ComplicationsChronic hives don't put you at any sudden risk of a serious allergic reaction (anaphylaxis). But if you do experience hives as part of a serious allergic reaction, seek emergency care. Signs and symptoms of anaphylaxis include dizziness, trouble breathing, and swelling of your lips, eyelids and tongue.

American Academy of Dermatology. Accessed April 25, 2017. Hives (urticaria). American College of Allergy, Asthma and Immunology.

Accessed April 25, 2017. Khan DA. Chronic urticaria: Standard management and patient education.

Accessed April 25, 2017. Goldsmith LA, et al., eds. Urticaria and angioedema. In: Fitzpatrick's Dermatology in General Medicine. New York, N.Y.: The McGraw-Hill Companies; 2012. Accessed April 25, 2017.

Khan DA. Chronic urticaria: Treatment of refractory symptoms. Accessed April 25, 2017. Bernstein JA, et al., eds.

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The diagnosis and management of acute and chronic urticarial: 2014 update. Journal of Allergy and Clinical Immunology.

2014;133:1270. Darlenski R, et al. Chronic urticaria as a systemic disease.

Clinics in Dermatology. 2014;32:420. Casale TB. Omalizumab for chronic urticaria. Journal of Allergy and Clinical Immunology: In Practice.