Allergic reactions can occur after an insect bite or sting.
Insect bites or stings from certain insects, such as bees, wasps, or ants, can trigger allergic reactions in some individuals. The other options listed (a sprain, an animal bite, and a fracture) may have different health concerns associated with them, but they are not typically associated with allergic reactions in the same way as insect bites or stings.