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过敏性紫癜是以坏死性小血管炎为主要病理改变的全身性疾病，可累及全身多器官，累及肾脏出现损害，称作紫癜性肾炎。
症状
本病小儿多见。多发生于出现皮肤紫癜后一个月内，除有皮肤紫癜、关节肿痛、腹痛、便血外，主要为血尿和蛋白尿。有的发生在紫癜消退后，没有任何症状，只是尿异常。经常会有患者以为皮疹消退病情就是好了，结果过一段时间体检发现尿中有血或者蛋白，延误了病情的诊治。所以发生了皮肤紫癜，一定不要忽视肾损伤的检查，及时发现尽早治疗。
应该做什么检查？
当皮肤、粘膜之下，出现青紫、瘀点、瘀斑，压之不褪色时考虑紫癜，如果有食物、药物过敏史诊断过敏性紫癜。紫癜性肾炎的排查除了检查尿常规之外，还可以检查24小时尿蛋白定量、尿微量白蛋白排泄率，查肾脏彩超、肾功能。自己观察可以看小便有无颜色加深及泡沫尿。
过敏性紫癜鉴别1.皮肤型需与药疹或血小板减少性紫癜作鉴别。药疹有一定的服药史，皮疹常分布于全身，停药后药疹即可消失。血小板减少性紫癜的淤斑可呈不规则分布，皮疹不隆起，无丘疹荨麻疹等。血小板计数减少，出血时间延长，骨髓象无改变。2.关节型关节肿痛者应与风湿性关节炎相鉴别，后者常有风湿活动，血清抗“O”抗体及血沉明显增高和增快。主要表现急性游走性、不对称性多关节炎，呈红、肿、热及触痛，运动受限等，可助鉴别。3.腹型腹痛型过敏性紫癜患者应与急腹症相鉴别，前者除有腹痛、腹泻外，一般无肌紧张及反跳痛，而急腹症除腹痛外，尚有肌紧张及反跳痛等，可助鉴别。4.肾型
需与急性肾小球肾炎、狼疮性肾炎、肾结核等区别。肾小球肾炎无皮肤紫癜、腹部及关节症状，狼疮性肾炎有多脏器损害，白细胞减少、血沉增快，狼疮细胞阳性及其他免疫指标阳性。
应与风湿性关节炎、急腹症、再生障碍性贫血、急性白血病、血小板减少性紫癜等疾病鉴别。
宿州德芝皮肤病防治所
宿州德芝皮肤病防治所，创立于3年，是国家卫生主管部门审批的皖北地区唯医院。我院坚持“引领行业标准，追求超群品质”的理念，三十多年来，成功治愈数十万例皮肤病患者，同时，为了满足不同患者的不同需求，我院特开展各项活动与诊疗服务，受到社会各界的广泛认可与赞誉！
专业诊疗：白癜风、牛皮癣、各种皮炎、湿疹、荨麻疹、扁平疣、青春痘、手足癣、体股癣、花斑癣、斑秃、雀斑、黄褐斑、血管瘤、鱼鳞病、瘙痒症、疤痕、红斑狼疮、阴虱、尖锐湿疣等各类皮肤病性病。
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医师
医院白癜风的症状有那些专业治疗白斑医院
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