Boils

Exodus 9:11

"And the magicians could not stand before Moses because of their boils; for the boils were on the magicians and all the Egyptians."

When I was a kid, boils were common among us. I had one on my leg thigh and the pain would be so hard I would pass out. Being 7 years old, my mom would pull out the boil with a Coke bottle in hot water turned up side down till a strong vacuum built up a suction, then put it on the boil...

The reason I put this down is the magicians had a lot of boils on them is why they didn't try and reproduce boils on the Israelite.

PJCopty