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男孩，7岁，发热3天，皮疹2天。患儿3天前无明显诱因出现发热，体温37.5~38℃。无咳嗽、流涕，无呕吐及腹泻。自服板蓝根没有明显效果。2天前开始躯干部出现红色皮疹并有水疱，略痒。病后进食正常，大、小便及睡眠均正常。既往体健，无肝病和心脏病史。上小学1年级。否认传染病患者接触史。查体：T37℃，P102次／分，R22次／分，BP90/60mmHg，体重23公斤。躯干部皮肤可见散在红色斑丘疹，可见水疱及部分结痂，浅表淋巴结未触及肿大，结膜无苍白，巩膜无黄染，舌面正常，双肺未闻及干湿性啰音，心界不大，心率102次／分，律齐，未闻及杂音。腹平软，无压痛，肝脾肋下未触及。移动性浊音（-），双下肢无水肿。实验室检查：血常规：Hb126g/L，RBC4.0×1012/L，WBC7.5×109/L，分类正常，Plt305×109/L。粪常规（-），尿常规（-）。要求：根据以上病历摘要，请写出初步诊断、诊断依据（如有两个以上诊断，应分别写出各自诊断依据，未分别写出扣分）、鉴别诊断、进一步检查与治疗原则。
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