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過敏感反応とかでしょうか？
過敏感反応が起きた部分が病斑になると思います
https://jspp.org/hiroba/q_and_a/detail.html?id=3086
https://www.meiji-seika-pharma.co.jp/agriculture/lecture/pdf/activator_08_01.pdf
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なるほど！ありがとうございます！