Exodus 9:10

And they will take ashes of the furnace and will stand before Pharaoh; and Moses will sprinkle it towards the heavens; and it will be a burning sore, breaking forth with pustules upon man and upon quadruped.

Deuteronomy 28:27

Jehovah shall strike thee with the burning sore of Egypt, and with tumors, and with scratching, and with the itch of which thou shalt not be able to be healed.

Treasury of Scripture Knowledge

Summary

And they took ashes of the furnace, and stood before Pharaoh; and Moses sprinkled it up toward heaven; and it became a boil breaking forth with blains upon man, and upon beast.

Bible References

A boil

Deuteronomy 28:27
Jehovah shall strike thee with the burning sore of Egypt, and with tumors, and with scratching, and with the itch of which thou shalt not be able to be healed.