患儿，男，10岁。全身出现皮疹1天，2天前有轻微头痛、倦怠、咽痛伴低热。皮疹先由面部逐渐发展至躯体及四肢。枕后淋巴结大。经治疗后2～3天皮疹就消退了。他的同学也有同样发病者。可能性最大的诊断是_内科学_全学科试题题库

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患儿，男，10岁。全身出现皮疹1天，2天前有轻微头痛、倦怠、咽痛伴低热。皮疹先由面部逐渐发展至躯体及四肢。枕后淋巴结大。经治疗后2～3天皮疹就消退了。他的同学也有同样发病者。可能性最大的诊断是
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