Plural of blain; multiple blisters, boils, or sores on the skin.
The plural form of 'blain' (Old English 'blegen'). Multiple skin afflictions were described collectively using this term in medieval and early modern English.
The biblical plagues mentioned 'blains' as one of the ten curses on Egypt—it's a horrifyingly specific medieval word for 'covered in painful skin sores'!
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