Exodus 9:8-10

8Then 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.

9Then it will become fine dust over all the land of Egypt, and will turn into 1boils breaking out with sores on every person and animal through all the land of Egypt.”

10So they took soot from a kiln, and stood before Pharaoh; and Moses tossed it toward the sky, and it became boils breaking out with sores on every person and animal.