No, a hornet does not leave a stinger in the skin when it stings. Hornets have smooth stingers, unlike bees. They can sting multiple times without their stinger becoming stuck in the skin. The venom from a hornet sting can be very potent. It can cause a lot more pain and swelling than a bee sting. If you are allergic to insect stings or if you were stung multiple times, it is important to get a doctor to see you immediately. As I mentioned earlier, there are neurotoxins in a hornet's sting that can cause intense reactions.