Urticaria - Hives

Japanese: 蕁麻疹 - じんましん

A disease in which the skin feels itchy, and when scratched, a rash appears, which is raised like welts with clearly defined borders, the size of a nail plate to the size of a palm. The rash disappears within a few minutes to a few hours, leaving no change afterwards, but it occurs repeatedly in spasmodic episodes. Rubbing the skin with a blunt object causes flushing and swelling (dermatographia). Most cases heal within a few days, but some cases are chronic and the rash does not stop for more than a month. Possible causes include autosensitization, menstrual disorders, pregnancy, sensitization due to foods, drugs, insect stings, etc., abnormal reactions to heat, cold, mechanical stimuli, light, etc., remote reactions to bacterial infections, gastrointestinal, hepatic, or renal diseases, a phenomenon of endocrine disorders, and psychological factors. Treatment involves removing the cause, as well as administering corticosteroids and antihistamines for acute cases, and autologous serum and hematopoietic drugs for chronic cases.
→ Related topics Allergic diseases | Allergic reactions | Photosensitivity | Diphenhydramine | Strophulus in children | Toxic rash | Skin disease

Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:

皮膚にかゆみを感じ，かくと境界の鮮明なミミズ腫れ状に隆起した爪甲(そうこう)大から手掌大までの発疹を生ずる病気。数分から数時間で消退し，後に変化を残さないが，発作性に反復して発疹する。皮膚を鈍器でこすると潮紅，浮腫を生ずる（皮膚描記症）。多くは数日で治癒(ちゆ)するが，慢性に１ヵ月以上発疹の止まらないものもある。原因は自家感作(かんさ)や，月経障害，妊娠，食品，薬品，昆虫刺傷などによる感作，温熱，寒冷，機械的刺激，光線などに対する異常反応，細菌感染の遠隔反応，胃腸・肝・腎疾患，また内分泌障害の一現象，精神的因子などが考えられる。治療は原因の除去のほか，急性症には副腎皮質ホルモン剤，抗ヒスタミン薬の投与，慢性症には，このほか自家血清，造血薬など。
→関連項目アレルギー性疾患｜アレルギー反応｜光線過敏症｜ジフェンヒドラミン｜小児ストロフルス｜中毒疹｜皮膚病

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