He had come out in (= become covered in) dark red blotches.

他身上长出了一块块深红色的斑。

牛津词典

His face was covered in red blotches, seemingly a nasty case of acne.

他满脸红斑，像是起了很严重的粉刺。

柯林斯高阶英语词典

His face was covered in ugly red blotch es.

他脸上有许多难看的红色大斑点.

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In this paper , the occurrence of watermelon bacterial fruit blotch was first reported in Jilin province.

首次报道了西瓜细菌性果斑病在吉林省的发生.

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Sooty blotch has become one of the most important diseases on many ornamental plants.

实践证明煤污病是园林植物的一类重要病害.

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Far below, the railroad yard squealed, a small busy blotch on the ancient silent desert.

远在山下, 铁路停车场里还在呜呜作响,发出铿锵的声音,在这片古老 、 沉寂的沙漠中只是一个忙忙碌碌的小斑点.

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But there had no blotch in negative control.

而阴性(空白)对照则相对应位置上无斑点.

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