A boil breaking forth with blains— This should be rendered, an inflammation breaking forth into blains; for blains generally arise from inflammations, and more usually break forth into boils, than boils into them: but if by boil we understand, with Johnson, only a sore angry swelling, it may then be very proper; for the original, word שׁחין shechin, signifies an inflammatory swelling. Bishop Patrick observes, that "the ashes, which they strewed into the air, came down a small fleet, like hoar-frost, which scalded the flesh of man and beast, and raised a blister upon every part where it fell;" for it is certain that the word shechin, signifies an inflammation which makes a tumor, as we translate it, Leviticus 13:18-19. It turned into such a grievous ulcer, that Moses speaks of it afterwards as an unusual plague, and calls it the botch, or inflammation of Egypt. Deuteronomy 28:27.
Related Commentaries of Exodus 9:9
Exodus 9:9
9 And it shall become small dust in all the land of Egypt, and shall be a boil breaking forth with blains upon man, and upon beast, throughout all the land of Egypt.