Most reactions to insect bites and stings are mild, causing little more than redness, itching, stinging or minor swelling. Rarely, insect bites and stings, such as from a bee, a wasp, a hornet, a fire ant or a scorpion, can result in severe reactions. Some insects also carry disease, such as West Nile virus.
For mild reactions
To take care of an insect bite or sting that causes a mild reaction:
- Move to a safe area to avoid more bites or stings.
- If needed, remove the stinger.
- Wash the area with soap and water.
- Apply a cool compress. Use a cloth dampened with cold water or filled with ice. This helps reduce pain and swelling. If the injury is on an arm or leg, elevate it.
- Apply 0.5 or 1 percent hydrocortisone cream, calamine lotion or a baking soda paste to the bite or sting several times daily until your symptoms go away.
- Take an antihistamine (Benadryl, others) to reduce itching.
Usually, the signs and symptoms of a bite or sting disappear in a day or two. If you're concerned — even if your reaction is minor — call your doctor.
When to seek emergency care
Call 911 or your local emergency number if the injured person experiences:
- Difficulty breathing
- Swelling of the lips, eyelids or throat
- Dizziness, faintness or confusion
- Rapid heartbeat
- Nausea, cramps or vomiting
- A scorpion sting and is a child
Take these actions immediately while waiting for medical help:
Feb. 17, 2018
- Ask the person if he or she is carrying an epinephrine autoinjector (EpiPen, Auvi-Q, others) to treat an allergic attack.
- If the person says he or she needs to use an autoinjector, ask whether you should help inject the medication. This is usually done by pressing the autoinjector against the person's thigh and holding it in place for several seconds.
- Loosen tight clothing and cover the person with a blanket. Don't give him or her anything to drink.
- If the person is vomiting, position him or her to prevent choking.
- Begin CPR if the person shows no signs of circulation, such as breathing, coughing or movement.
- AskMayoExpert. Stinging insect allergy. Rochester, Minn.: Mayo Foundation for Medical Education and Research; 2017.
- Stinging insect allergy: Tips to remember. American Academy of Allergy, Asthma & Immunology. http://www.aaaai.org/conditions-and-treatments/library/allergy-library/stinging-insect-allergy.aspx. Accessed Jan. 9, 2018.
- LoVecchio F. Scorpion envenomation causing neuromuscular toxicity (United States, Mexico, Central America, and Southern Africa). https://www.uptodate.com/contents/search. Accessed Jan. 9, 2018.
- Kermott CA, et al., eds. Emergencies and urgent care. In: Mayo Clinic Guide to Self-Care. 7th ed. Rochester, Minn.: Mayo Foundation for Medical Education and Research; 2017.
- Insect stings. Merck Manual Professional Version. http://www.merckmanuals.com/professional/injuries_poisoning/bites_and_stings/insect_stings.html. Accessed Jan. 9, 2018.
- What to do in a medical emergency. Bites and stings. American College of Emergency Physicians. http://www.emergencycareforyou.org/Emergency-101/Emergencies-A-Z/Bites-and-Stings/. Accessed Jan. 9, 2018.
- Castells MC. Insect bites. https://www.uptodate.com/contents/search. Accessed Jan. 9, 2018.
- Campbell RL, et al. Anaphylaxis: Emergency treatment. https://www.uptodate.com/contents/search. Accessed Jan. 9, 2018.