What is contact urticaria?

Contact urticaria is mainly skin contact with certain allergens after the occurrence of a certain wheal, or skin produced a certain erythema, so also known as contact urticaria. Clinically, it can be generally divided into immune contact urticaria, non-immune contact urticaria, there is a mechanism is not clear contact urticaria. For non-immune basic urticaria, almost all people may occur, mainly the patient exposed to certain substances to stimulate the skin, directly produced an allergic inflammation, or produced a certain wheal and edema, such as mosquito bites caused. It may also be caused by immune factors, such as exposure to certain allergens, may cause skin to produce certain allergic changes, and finally produce a certain wheal. Of course, there may also be unknown reasons, or unknown mechanism of contact urticaria, but also show a certain amount of this wind mass, such as showing amine sulfate caused by contact urticaria.