Exodus 9:5-9

And the Lord set a definite time, saying, “Tomorrow the Lord will do this thing in the land.”

So the Lord did this thing on the next day, and all the livestock of Egypt died; but not one of the livestock of the sons of Israel died.

And Pharaoh sent men, and they learned that, behold, not even one of the livestock of Israel was dead. But the heart of Pharaoh was hardened, and he did not let the people go. The Plague of Boils

Then the Lord said to Moses and Aaron, “Take for yourselves handfuls of soot from a kiln, and Moses shall toss it toward the sky in the sight of Pharaoh.

Then it will become fine dust over all the land of Egypt, and will turn into boils breaking out with sores on every person and animal through all the land of Egypt.”