What causes acute measles?

Acute urticaria is caused by a temporary increase in vascular permeability caused by localized edema of the skin and mucosa, belonging to an allergic disease, but most patients with urticaria can not find the exact cause. Part of the patient's recent constitution, such as a period of time the body resistance is relatively poor, can not tolerate some allergens low concentration or strong concentration of stimulation may cause urticaria performance. The rest of the common factors are: Eating or respiratory tract inhalation of allergic things, such as shrimp, eggs, animal dander, dust, mites, dust, pollen, etc., or some infectious factors such as viruses, bacteria, fungi or viruses, drug factors such as penicillin, mental endocrine factors, etc. can cause the occurrence and development of urticaria.