Jiangan Zhang, Zhengzhou
概述：
焦痂
浅表的表皮坏死至全层皮肤组织破坏
颜色：棕色、黑色
大小：数毫米至数厘米
可累及任何部位皮肤
好发于无侧枝循环的终末血管分布处
可演变为溃疡
愈合后遗留萎缩或瘢痕
可继发感染
可继发于如下情况：
下肢静脉溃疡、周围动脉闭塞、糖尿病足溃疡、深度热烧伤或化学烧伤（3度）、深部感染、肿瘤
炭疽病原入侵处、立克次体病（焦痂）
大块组织破坏：血管闭塞、肿瘤生长血供不足、感染、阻塞性血管疾病
外伤：大范围破坏
外源性有害因素：化学性（酸或碱）、烧伤
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