Urticaria etiology and clinical types

The disease is a common allergic skin disease. Clinical manifestations of the limitations of size rubella block damage, Suddenly occurred quickly dissipated, itching dramatic, the more we do not leave any traces, the Chinese equivalent of the addiction measles.
[Causes]
A number of factors caused urticaria, are: 1. Inhalation, such as pollen, animal, smoke, fungal spores and certain volatile substances. 2. Food such as fish, shrimp, eggs, milk and other proteins or other rich food. 3. Drugs such as vaccines, heterologous serum, blood transfusion, penicillin, Furazolidone, such as aspirin. 4. Parasitic infections, bacteria (such as tonsillitis, nose beside sinusitis, chronic appendicitis, etc.), viruses (such as hepatitis,(Coxsackie) virus), fungi (eg dermatomycoses). 5. Physical factors such as sunlight, cold, damp heat, and so on. 6. Factors found in the spirit of the spirit of tension or excitement, and after exercise. 7. Other threatened, as some insect bite thorn sting, a contact of animals and plants such as nettle here, drugs vine, as well as suffering from some skin or systemic diseases, such as mast cells increased disease, rheumatic fever, leukemia and certain endocrine diseases. The mechanism is not currently fully understand. Acute urticaria is generally believed that the majority of type I allergic. Because mast cells caused by the release of histamine, causing telangiectasia, increased permeability of Health, a large number of plasma proteins into the dermis, the clinical performance of the corporation or limitations for wind edema. Some of urticaria, allergic type III. III allergic to antigen-antibody complex reaction, antigen-antibody complex in the course of activation of complement produce allergic toxins, stimulate mast cells to release histamine, leading to urticaria occurred. In addition to the allergy, some stimulating factor, as some drugs, food, physical factors, chemical substances, such as enzymes and tissue damage can also direct role in the mast cells to release histamine and cause urticaria. Also, some urticaria with congenital genetic quality (ectopic).
[Types of]
There are unusual urticaria, vascular edema, artificial urticaria, solar urticaria, cold urticaria, cholinergic urticaria, and other types.