Exodus 9:10

And they took ashes of the furnace, and stood before Pharaoh; and Moses sprinkled it toward the heavens; and it became boils with blisters breaking out on man and on cattle.

Deuteronomy 28:27

Jehovah will smite thee with the ulcers of Egypt, and with boils, and with the scab, and with the itch, whereof thou canst not 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 will smite thee with the ulcers of Egypt, and with boils, and with the scab, and with the itch, whereof thou canst not be healed.