When a wasp stings, it injects venom into the skin, causing pain, redness, and swelling. Unlike bees, wasps can sting multiple times because their stingers are smooth and do not detach.

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.

The most serious reaction to an insect sting is a systemic allergic reaction known as anaphylaxis (described below). This requires treatment right away. What Are the Symptoms of an Allergic Reaction?