游走性红斑
离心性扩大的环状红斑性皮肤病。
蜱（高达40%为篦籽硬蜱）叮咬后伯氏疏螺旋体（afzelii和garinii）感染真皮层并引起扩散。好发于中欧和东欧的森林区，斯干纳维亚半岛；好发季节为五月、七月和十月。易患个体为农民、晨练者、爬山运动员和养狗者，发病率为每年每10万人中1～15 人患病。
¤ 潜伏期1至4周。
¤ 皮肤：界限清楚的环状红斑（有时中心有叮咬痕迹），中心消退，红斑向四周扩展。中心变异表现：苍白、红斑、出血、水疱。可见多环性红斑。
¤ 可能出现的系统症状：头痛、颈部疼痛、关节痛和发热。
脑膜神经根炎、关节炎、心肌炎（传导紊乱）和脑病。
依据病史、临床特点、皮损取材PCR：伯氏螺旋体DNA，螺旋体血清学通常阴性。
多西环素100mg，每日2次，共14天。
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