血风疮是的病因

       什么原因导致血风疮：

       皮肤瘙痒是一种自觉瘙痒，临床上无原发性损伤的皮肤病。皮肤瘙痒的原因尚不清楚，主要与糖尿病、肝病、肾病等疾病有关；但也与一些外部因素有关，如寒冷、温暖、化纤织物等。皮肤瘙痒可分为泛发性和局限性，泛发性皮肤瘙痒患者最初皮肤瘙痒仅限于一个地方，然后逐渐扩展到身体的大部分或全身，皮肤瘙痒往往是阵发性的，特别是在夜间，由于持续抓挠、抓痕、血痂、色素沉着和苔藓变化等继发性损伤。局限性皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮肤皮