Anaphylactic Reaction Very Serious. The sudden onset of hives with trouble breathing or swallowing. This is a severe allergic reaction to an allergic food or drug. Most often begins within 30 minutes of swallowing the substance. Always within 2 hours of exposure. Causes of Localized Hives Irritants.
Hives just in one spot are usually due to skin contact with an irritant. They are not an allergy. Many plants cause skin reactions. Sap from evergreens can cause local hives. Playing in the grass can cause hives on exposed skin. Pet Saliva. Some people get hives where a dog or cat has licked them. Some children get hives if a food is rubbed on the skin.
An example could be a fresh fruit. For patient support organisations go to www. ASCIA resources are based on published literature and expert review, however, they are not intended to replace medical advice. Information for the community about allergic diseases, immunodeficiencies and other immune diseases. See latest edition here Join our mailing list:.
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Contact Us Locate a Specialist Sitemap. Autoimmunity Drug allergy Food allergy Food other adverse reactions Immune system Immunodeficiencies Insect allergy bites and stings Other allergies. Home Patients Allergy and the skin Hives urticaria. Hives Urticaria Hives the common term for urticaria , are pink or red itchy rashes, that may appear as blotches or raised red lumps wheals , on the skin.
Can hives occur anywhere else? Hives are rarely due to a serious underlying disease Whilst a clear cause of hives in not obvious in many cases, causes may include: Infection from a virus is the most common cause of hives in children, especially if they last for more than 24 hours.
Contact allergy to plants or animals may cause localized hives. For example, some people break out in hives when they sweat, or rub their skin. Other people find that cold temperatures, sunlight or friction trigger an outbreak, and in some rare cases, water can also be a trigger for hives.
If you have physical urticaria, your hives will normally develop within minutes, and then fade within 1 hour. If you think that you may have this form of hives, try to identify your triggers and avoid them as much as you can.
You may also find that it helps to take an antihistamine when you break out in a rash, but you should see a doctor if you intend to take antihistamine medications for more than a couple of days in a row. You should see a doctor if your symptoms do not improve after 2 days, your rash seems to be getting worse or your hives keep going away and then coming back, as this could be a sign that you are allergic to something.
You should also see a doctor if you have a high temperature or notice any swelling under your skin angioedema. We include references at the end of every article, so you know where we get our facts. When we talk about popular health trends or claims, we'll always tell you if there's very little or no evidence to back them up.
Our medical team also checks our sources, making sure they're appropriate and that we've interpreted the science correctly.
Erythema multiforme is a skin reaction usually mild caused by an allergy or infection. Rosacea is a common but poorly understood long-term chronic skin condition that mainly affects the face. Symptoms begin with episodes of flushing w Granuloma annulare is a rash that looks like a ring of small bumps. McGraw-Hill; Accessed Aug. Hives urticaria. American College of Allergy, Asthma, and Immunology. Ferri FF. In: Ferri's Clinical Advisor Asero R. New-onset urticaria.
Zuraw B, et al. An overview of angioedema: Clinical features, diagnosis, and management. American Academy of Dermatology. Thompson DA. American Academy of Pediatrics; Briggs JK. In: Triage Protocols for Aging Adults. Wolters Kluwer; Kelly AP, et al.
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