Wheal

As a wheal is defined as point-like button up or plateau-like elevations of the human skin caused by mechanical damage to the skin (eg by scratching, rubbing, or insect bites ) or may be signs of allergy or hives.

Symptoms

A wheal is caused by an increased permeability of the dermal blood vessels (usually histamine) from mast cells is caused in turn by an excessive release of mediators and leads to water retention in the upper epidermis. Wheals are usually button - or plateau- shaped, often paler than its surroundings and of different sizes. You can be shaped circular or irregular. Hives are often surrounded by a red halo. Also typical for hives is a long or short term occurring itching.

Causes

Plant toxins

Hives often appear after contact with certain plants, especially in nettles, but also in tropical plants such as the nettle tree and poison ivy. But even the pollen from plants can cause hives and skin rashes (see hay fever).

Insect bites and stings

Hives are often typical symptoms of insect bites. Stinging insects such b. Fleas, Platt bugs, ticks, mosquitoes and rain brakes leave due to their saliva output during blood eyes itchy wheals, which are particularly noticeable discomfort in people with sensitive skin.

Allergies

Hives are also formed in allergies of different nature. Be it a food allergy, a known allergy to light or drug intolerance. All have in common is an increased wheal formation in the neck and Hüftnähe that may fail in the longer term. A specific allergy needs to be diagnosed and treated by a dermatologist.

Hives

Another trigger of hives, the so-called hives ( urticaria ) be a caused by excessive histamine release as a result of stress or external influences (eg, cold, heat or air pressure changes ) skin irritation. Hives takes its name from the swarm occurring wheals, reminiscent of a contact with nettles. The wheals appear in hives with or without red halo on the shoulder, abdomen, thigh and forearm. Usually the hives disappear within minutes or an hour or two (acute hives) again, but they can also permanently occur (chronic hives). Also hives must be diagnosed and treated by a doctor.

Countermeasures

If excessive hives, whose cause can not be determined unambiguously, consult a doctor, who notes with the help of skin tests and laboratory tests, which is responsible for the hives. He makes a diagnosis and the necessary therapies to successfully treat. In most cases the intake of so-called antihistamines enough. Sufferers should not additionally irritate by scratching hives, rather immediate cooling of the affected area of ​​skin is recommended. With nettle or insect bites rubbing the welts with vinegar to bring relief.

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