When a yellow jacket stings, its barb-like stinger pierces the skin and injects you with venom consisting of toxins called mastoparan and phospholipase A1 and A2. Unlike bees, yellow jackets can ...

Wasps, which include yellow jackets and hornets, can be aggressive and sting multiple times. To treat a wasp sting, wash it with soap and water, then reduce swelling with ice and antihistamines.