Urticaria is an allergic skin reaction to an irritant. Allergic urticaria appears as a rash. A rash with allergic urticaria includes red relief formations, which are sources of itching. An allergic urticaria appears unexpectedly, then it passes and reappears on the skin.
Causes of Allergic Hives
Allergic urticaria, as a rule, occurs after direct contact with an irritant that can be found in food, medications, in the air, or on things.
The causes of skin rashes, similar to hives, can be the sun, hot air or water, stressful situations. In this case, the cause of allergic urticaria is considered to be the production of histamine in the skin layers.
Allergic urticaria most often occurs when drugs are exposed to the body. This is due to the disorder of skipping the walls of blood vessels.
Allergic urticaria can be caused by analginum, novocaine, sulfa drugs, penicillin, vitamins B, serums and other medications.
Allergic urticaria can be caused by food irritants – river fish, eggs, dairy products, and, in addition, poor tolerance to the bites of some insects.
Signs of an Allergic Urticaria
Allergic urticaria is characterized by an unexpected occurrence, the formation of intolerable itching, burning sensations and redness to us in different areas of the skin, and, in addition, on the mucous membranes of the oral cavity. Blisters with allergic urticaria can have different sizes and shapes, they can also be soldered, while there is a sharp deterioration in well-being. Allergic urticaria is more often determined by an allergy to drugs or to certain foods.
The so-called giant allergic urticaria, or Quincke’s edema, is characterized by the equally unexpected occurrence of limited swelling of the mucous membrane or area of the skin and layer of subcutaneous fat, as well as genitalia. With this swelling, the affected skin becomes white or pink. Deterioration of health is not observed. Swelling may subside after a few days or hours. Quincke’s edema may be accompanied by a common allergic urticaria.
Chronic allergic urticaria, as a rule, occurs against a background of prolonged contact with an irritant caused by sources of an infectious disease of a chronic nature, for example, tonsillitis or adnexitis. Such urticaria is characterized by a disorder of the gastrointestinal tract, liver function, etc. Repeated diseases, characterized by the formation of blisters on the skin in different places, are interspersed with periods of rest, which can have different durations. During an attack of an allergic urticaria, migraines, fatigue and weakness, a sharp increase in temperature, swelling of the mucous membrane of the gastrointestinal tract and, as a result, diarrhea and vomiting are often observed. Intolerable itching causes sleep disturbances and nervous diseases.
Solar allergic urticaria is a type of photodermatitis, which, as a rule, occurs in people suffering from liver diseases and a disorder of porphyrin metabolism with poor tolerance to sunlight. Most often, women suffer from this. The disease is characterized by the development of redness on barely covered parts of the body. Under the condition of prolonged exposure to the sun, skin rashes can occur when health conditions worsen, for example, respiratory dysfunction, cardiac dysfunction, or shock. Diagnosis of this disease is not complicated.