The lice
The second sign upon Pharaoh's people after the flood: the lice — others read it as fleas, weevils, or the small wingless locust.
In the Qur'an · 1
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فَأَرْسَلْنَا عَلَيْهِمُ ٱلطُّوفَانَ وَٱلْجَرَادَ وَٱلْقُمَّلَ وَٱلضَّفَادِعَ وَٱلدَّمَ ءَايَـٰتٍ مُّفَصَّلَـٰتٍ فَٱسْتَكْبَرُوا۟ وَكَانُوا۟ قَوْمًا مُّجْرِمِينَ
So We sent against them the flood and the locusts and the vermin and the frogs and the blood - a succession of clear signs. But they were arrogant and became a guilty folk.