hives (urticaria, urticaria) - a skin disease, mainly allergic origin, the main symptom is the sudden emergence on the swollen skin, severely itchy blisters pale pink flat.
rash can occur on any part of the body, including the face, trunk, extremities, lips, tongue and throat or ears.Blisters can be a different size from a grain of rice to a tea saucer.The blisters may merge, forming a very large pockets.Symptoms are held from a few hours to several days.
Angioedema (angioneurotic edema) - response (usually allergic) to the impact of a variety of biological and chemical substances.Its main symptoms are swelling of the lips, the cheeks, the skin around the eyes, hands, feet and the vulva.Changes can be stored up to several days, greatly changing the appearance of man.In severe cases, there is swelling of the tongue, throat, or lungs, which violates the patency of the airway
urticaria and angioedema are caused by the action of histamine.Histamine - active substance secreted by special cells located along the subcutaneous blood vessels.It increases the permeability of small blood vessels, causing them to exit from the liquid portion of blood and the formation of edema.
Histamine is released during allergic reactions to insect bites, exposure to sunlight, chemicals, food and pharmaceuticals.Sometimes the exact cause of hives can not be identified.
In order to identify the possible cause of rash and edema, the doctor conducts a thorough survey of the patient, wondering at the same time not only the symptoms and signs of disease, but also eating habits, peculiarities of work (whether the impact has ANY KINDor irritating substances or physical agents), as well as diseases of the family members.
Usually, diagnosis involves a therapist, an allergist, immunologist and dermatologist.
To detect allergens are appointed by skin tests.In addition, conducted blood tests and other laboratory tests to assess overall health and identify any systemic diseases.
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