Why can you rise urticaria

Urticaria a lot of see, we know this urticaria, common people commonly known as wind lumps, wheals, wind blocks, it is caused by allergies, most of them are due to allergies. Generally we say urticaria, are referring to allergic urticaria, because you an allergen, stimulate the body, produce an allergic reaction, the skin will be red a large bulge. It is due to allergic reaction after the allergen, blood vessels loose, blood permeability also increased, plasma leakage out, in the subcutaneous long a wheal, itching very badly, that is to say, this wheal, urticaria, is caused by allergies. This thing is very strange. After it rises, it will disappear for about half an hour or an hour. After it disappears, it will rise again and again. Therefore, we say that it is like a gust of wind. One gust of wind comes and goes, and the second gust comes again. Therefore, we common people call it a wind lump. This kind of rash is not caused by the wind, it is caused by allergy, just like the wind, it comes for a while and disappears, so it is called urticaria, it is caused by allergy, not by wind.