If evidence of infection, such as increased pain, swelling, redness, and warmth, develops at the sting site, you should call your doctor for an appointment. If you have signs of any of these, you should see your doctor. In these cases, take special care to inform your doctor that you have had a recent insect sting. If any reaction beyond the site of the sting develops, go directly to a hospital's Emergency Department. These reactions would include hives, difficulty breathing or swallowing, dizziness, or fainting.
Physical exam is the most important part of the evaluation of insect stings.
Vital signs, particularly blood pressure and pulse, are very important to check for shock. Examination should also include the skin for swelling and hives, the lungs for wheezing, and the upper airway for possible swelling or obstruction. An ECG or chest x-ray may be helpful but are not needed in every case. Other laboratory tests are usually not helpful. Epinephrine usually is given as an injection in the arm.