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Causes of Nettle rash原因荨麻疹

Acute urticaria is thought to be activated by a trigger that causes a release of histamine and other chemicals from under the skins surface.急性荨麻疹被认为是激活一个触发导致释放组胺和其他化学品从下皮肤表面。 This causes inflammation and fluid to gather under the skin, causing wheals and the blood vessels to dilate.这会导致炎症和流体聚集皮肤下，造成wheals和血管扩张。 The trigger is unknown in approximately half of the cases of acute urticaria.触发是未知在大约一半的案件急性荨麻疹。

Known triggers include:众所周知，触发包括：

  • Medicines - an allergic reaction to certain medicines can cause the urticaria rash.药品-一过敏反应某些药物可引起荨麻疹的皮疹。 These medicines include anti- inflammatory drugs, and antibiotics (especially penicillin and aspirin).这些药物包括抗发炎药物，抗生素（尤其是青霉素和阿司匹林） 。
  • Foods - many foods have been implicated in this hypersensitive reaction, the most common are nuts, eggs, chocolate, citrus fruits, strawberries, shellfish and food additives.食品-许多食品有牵连在这过敏性反应，最常见的是坚果，鸡蛋，巧克力，柑橘类水果，草莓，贝壳类及食品添加剂。
  • Infections - including colds and flu.感染-包括感冒和流感。 Also hepatitis B, glandular fever and intestinal parasites have been associated.此外， B型肝炎，腺出现发烧及肠道寄生虫病已关联的。
  • Irritants, causing local urticaria - many things have been implicated including latex, nettles, plants, chemicals and insect bites.刺激，造成当地荨麻疹-很多事情有牵连，包括乳胶，荨麻，植物，化学品和昆虫叮咬。
  • Other triggers – can include heat, exercise, exposure to cold, pressure and rarely exposure to sunlight.其他触发â € “可以包括热，运动，接触到冷，压力和很少接触到阳光。

Chronic urticaria is rarely activated by such triggers, but usually starts as an autoimmune response, where antibodies which usually fight bacteria and viruses, appear to cause histamine and other chemicals to be released under the skin, causing the same response as above.慢性荨麻疹是很少活化，例如触发器，但往往开始作为一个自体免疫反应，如抗体通常扑灭细菌及病毒，似乎事业的组胺和其他化学品被释放皮肤下，造成相同的反应如上。 The reason is unknown.原因是未知之数。