Allergic urticaria, also known as wheal, is a local edema reaction caused by the expansion and permeability of skin tissue. It shows that skin lesions can spread all over the body, mostly light and flat marks with irregular size and shape, accompanied by obvious local itching, which is usually relieved within 2-24 hours, but new rashes will appear repeatedly, and the course of disease is often as long as several months. This is a common skin disease. How is allergic urticaria caused? In fact, the following factors can cause allergic urticaria.
1, dust
Allergic urticaria is mostly caused by microorganisms living in dust, including cotton fabric, fur products and various fiber products, feather dusters and so on.
2. Cosmetics
Essence, pigment, fruit acid, alcohol, preservative, thickener, solidified fat and other ingredients. It will irritate the skin and cause different degrees of skin damage.
3. Pollen
In the season when flowers need to breed, a lot of pollen will be scattered in the air. People who stay outdoors will inhale some pollen particles in their lungs and be absorbed by their skin.
4. food
Common foods, such as fish, shrimp, crab, freshwater shellfish, pineapple, mango and nuts, can cause allergic urticaria.
5. medicine
Penicillin and sulfonamides may induce urticaria.
6. Age
With the increase of age, the imbalance of immunity is often the inducement.
7. pets
Domestic long-haired animals, such as cats and dogs, have hair and other substances scattered in the air, which can easily lead to urticaria after inhalation.
8. Four seasons
Due to environmental factors such as seasons, bacteria, robe powder and pollen scattered in the air will make the human body secrete a lot of histamine and induce urticaria.