Hives in the form of an allergic reaction with severe redness, blisters and itching is a common summer problem – why it should be taken very seriously, the doctor explains.
< br>According to the doctor, dermatologist and dermatosurgeon Grigory Goldin, in some cases, red spots that occur with urticaria are accompanied by severe itching that causes torment. A similar reaction of the body indicates a severe allergic reaction – but what can provoke such a urticaria? Urticaria
Goldin explained that urticaria occurs when certain triggers begin to affect mast cells, endogenous cells that help the body fight pathogens. When mast cells become active, they send pro-inflammatory messenger substances, primarily histamine, to the surrounding tissues. It dilates blood vessels and makes them more permeable to water. This leads to the fact that the skin becomes red and swollen.Scientists have found out the causes of allergy to running
In addition, messenger substances bind to nerve fibers, which causes the effects of itching, swelling.At 4 years, allergy to water, warm and cool weather
What stimulates mast cells and causes unpleasant symptoms? The doctor listed a number of factors.
- Viral infections.
- Streptococcal bacteria.
- Food such as cow's milk or fruits.
- Insect bites.
- Pollen and animal hair.
- Some medicines (for example, for rheumatism).
- Exposure to extreme temperatures – heat, cold.
- Autoimmune reactions of the body.
- Some diseases, in particular inflammation of the gallbladder bubble.
- Physical or mechanical irritants that directly affect the skin, including one's own hair, clothes.
What is the particular danger of urticaria. The occurrence of such an allergic reaction is often unpredictable, the exact trigger remains unexplained. Meanwhile, sudden symptoms of hives can be a signal of anaphylaxis – an allergic shock that can be deadly. Its symptoms are weakening of blood circulation up to collapse, nausea, diarrhea, shortness of breath, tachycardia. In the case when there is a strong release of histamine, and it penetrates deep into the tissues, angioedema (Quincke's edema) is possible with a characteristic swelling of the skin, mucous membranes and subcutaneous fatty tissue. This is a very dangerous reaction of the body, fraught with suffocation and requiring prompt assistance.
Earlier, the portal MedikForum.ru wrote that mouth ulcers can be a sign of serious pathologies. 
Grigory Goldin Health dermatocosmetologist , dermatosurgeon