Q: I think something stung me while I was trimming chewed leaves off of my plant. I was expecting a wasp to fly out, but all I see is this insect that I think is a caterpillar on the bottom of a leaf.

“It's almost akin to getting hit by a jellyfish.” tzooka/Getty Images Spiky, green caterpillars with painful stings have been popping up in the eastern United States. With their distinct, saddle-like ...