A blain is an inflammatory swelling on the body. In one of the plagues of Egypt the dust became a 'boil breaking forth with blains upon man and upon beast' (Ex 9:9-10). See Botch, Medicine, and cf. Wyclif's tr of Job 2:7 'He smot Iob with the werste stinkende bleyne fro the sole of the fot unto the nol.' The word is still retained in the compound chilblain.
The soot will become dust over the entire land of Egypt, and it will become boils erupting into sores on people and animals throughout the land of Egypt." So they took soot from the kiln and stood before Pharaoh. Then Moses threw it into the air,and it became boils producing running sores on people and animals.
So Satan left the LORD's presence and struck Job with terrible boils from the sole of his feet to the top of his head.
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