I Have Bites in My Knees Then Disappears Then Comes Back Again

Hives (Urticaria)

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Images of Urticaria (Hives)

Overview

Hives (urticaria), too known equally welts, is a common peel condition with an itchy rash of pink to red bumps that appear and disappear anywhere on the torso. An individual lesion of hives typically lasts a few hours (upward to 24 hours) before fading away, and new hives can appear as older areas disappear.

Physicians arbitrarily divide hives into acute (new or periodic episodes lasting fewer than 6 weeks) and chronic (periodic episodes lasting more 6 weeks). Though many people accept a single episode of astute hives that goes away within a few days to weeks, some individuals may have chronic hives that persist intermittently for years. More oftentimes than not, the offending amanuensis is never identified in those who suffer from chronic hives.

Hives can be triggered by many things, including:

• Medications, especially aspirin, ibuprofen, naproxen, narcotic painkillers, and antibiotics Infections with viruses, bacteria, or fungi
• Environmental allergies such every bit insect bites, pollen, mold, and animal dander
• Physical exposures such every bit heat, cold, water, sunlight, and pressure
• Medical weather condition including some blood diseases and cancer
• Food allergies such every bit from strawberries, eggs, nuts, and shellfish
• Stress

In many cases, the causative amanuensis is not identified despite extensive testing. This is referred to as idiopathic urticaria. In approximately fifty% of idiopathic urticaria outbreaks, hives are most likely caused past a reaction from the person's own immune system (autoimmune reaction).

Who's at risk?

Hives appear in people of all ages, of all races, and of both sexes.

Astute hives are nigh common in children and young adults, and chronic hives are more frequently seen in females, peculiarly centre-anile women.

Hives are very common; it is estimated that up to 20% of the population may develop them at some point in their lives.

Signs and Symptoms

The most common locations for hives include:

• Trunk
• Upper arms or upper legs
• Hands and anxiety
• Face

An individual lesion of hives appears equally a well-defined pinkish-to-cerise swelling, ranging in size from ii mm to over 30 cm. Some lesions may develop a lighter eye. Hives ordinarily appear in groups or batches. They are classically incredibly itchy. Individual lesions of hives disappear within 24 hours, though a single episode with the development of new lesions may last much longer.

Dermographism is a type of urticarial reaction that appears within a few minutes of scratching the pare. The rash is usually seen in a straight line (linear) pattern. This is usually a sign of a person with sensitive skin.

Swelling of the eyes, mouth, hands, feet, or genitals tin can sometimes occur with hives. This swelling, chosen angioedema, unremarkably goes away within 24 hours, but information technology can be quite severe and life-threatening when swelling of the airway occurs.

Usually itchy, hives can also burn or sting.

Self-Intendance Guidelines

If you are experiencing mild hives, you might:

• Have cool showers.
• Employ absurd compresses.
• Wear loose-fitting clothes.
• Avert strenuous action.
• Use an over-the-counter antihistamine such as diphenhydramine or loratadine.

In addition, try to discover what is triggering your hives and avoid whatever information technology might exist. In particular, pay attending to any new foods that were ingested or new medications that were started.

When to Seek Medical Care

Telephone call 911 if you are feeling lightheaded or are having difficulty breathing or swallowing associated with your hives.

In non-urgent situations with hives, see your doctor if the hives practice not better with handling or if they keep to appear for more than a few days.

Before visiting your md, effort to notice what might be triggering your hives and whether it improves or worsens with exposure to heat, cold, pressure level, or vibration. Accept a listing of every medication (prescription or over-the-counter), supplement, or herbal remedy you may accept taken recently. Also, retrieve whatsoever contempo illnesses you may accept had since some illnesses (or their treatments) can trigger hives.

Treatments Your Medico May Prescribe

After confirming that you have hives, the dr. will work with y'all to find the possible cause. Your md will take a detailed medical history and may do blood work, urine tests, or X-rays.

Manifestly, the best treatment for hives is to discover any triggers and stop your exposure to them. However, virtually people with hives practise not know the cause, and they require medications to get rid of them.

The most common medications for hives include:

• Sleep-causing (sedating) type-1 antihistamines such as diphenhydramine or hydroxyzine
• Non-sleep-causing (non-sedating) type-1 antihistamines such every bit loratadine, fexofenadine, desloratadine, or cetirizine
• Type-2 antihistamines such as ranitidine, cimetidine, or famotidine
• Doxepin
• Montelukast, zafirlukast, or zileuton

In rare situations, your doc might prescribe oral corticosteroid pills.

Trusted Links

MedlinePlus: HivesClinical Data and Differential Diagnosis of Urticaria (Hives)

References

a, Jean L., ed. Dermatology, pp.287-302. New York: Mosby, 2003.

Freedberg, Irwin K., ed. Fitzpatrick'south Dermatology in General Medicine. 6^th ed. pp.547, 1129, 1137. New York: McGraw-Hill, 2003.

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Source: https://www.skinsight.com/skin-conditions/adult/urticaria-hives

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