Insect Bites and Stings and Spider Bites - Topic Overview

Insect and spider bites often cause minor swelling, redness, pain, and itching. These mild reactions are common and may last from a few hours to a few days. Home treatment is often all that is needed to relieve the symptoms of a mild reaction to common stinging or biting insects and spiders.
Some people have more severe reactions to bites or stings. Babies and children may be more affected by bites or stings than adults.
Examples of problems that are more serious include:
Use the Check Your Symptoms section to decide if and when you should see a doctor.


Insect Bites and Stings and Spider Bites - Home Treatment

Common bites and stings

Most bites and stings will heal on their own without a visit to a doctor. There are several things you can do to relieve pain and itching and prevent infection from a bite or sting.
Insect or spider bites or stings or contact with caterpillars
  • Move away from the stinging or biting insect. Bees will alert other bees, making them more likely to sting.
  • Remain as calm and quiet as possible. Movement increases the spread of venom in the bloodstream.
  • If you have been stung by a bee and the stinger is still in the skin, remove the stinger as quickly as possible.
  • If you have been stung on the arm or leg, lower the limb at the time of the sting to slow the spread of venom. Hours later, if swelling is present, you can elevate the limb to help reduce swelling.
  • After contact with a puss caterpillar , remove broken-off spines by placing cellophane tape or commercial facial peel over the area of the contact and pulling it off.
Relieve pain, itching, and swelling
  • Apply an ice pack to a bite or sting for 15 to 20 minutes once an hour for the first 6 hours. When not using ice, keep a cool, wet cloth on the bite or sting for up to 6 hours. Always keep a cloth between your skin and the ice pack. Do not apply ice for longer than 15 to 20 minutes at a time, and do not fall asleep with the ice on your skin.
  • Elevate the area of the bite or sting to decrease swelling.
  • Try a nonprescription medicine for the relief of itching, redness, and swelling. Be sure to follow the nonprescription medicine precautions.
    • An antihistamine taken by mouth, such as Benadryl or Chlor-Trimeton, may help relieve itching, redness, and swelling. Don't give antihistamines to your child unless you've checked with the doctor first.
    • A spray of local anesthetic containing benzocaine, such as Solarcaine, may help relieve pain. If your skin reacts to the spray, stop using it.
    • Hydrocortisone 1% cream or calamine lotion applied to the skin may help relieve itching and redness. Note: Do not use the cream on children younger than age 2 unless your doctor tells you to. Do not use in the rectal or vaginal area in children younger than age 12 unless your doctor tells you to.
  • After the first 6 hours, if swelling is not present, try applying warmth to the site for comfort.
Talk to your child’s doctor before switching back and forth between doses of acetaminophen and ibuprofen. When you switch between two medicines, there is a chance your child will get too much medicine.
  • Carefully read and follow all directions on the medicine bottle and box.
  • Do not take more than the recommended dose.
  • Do not take a medicine if you have had an allergic reaction to it in the past.
  • If you have been told to avoid a medicine, call your doctor before you take it.
  • If you are or could be pregnant, do not take any medicine other than acetaminophen unless your doctor has told you to.
  • Do not give aspirin to anyone younger than age 20 unless your doctor tells you to.
  • Consider a home remedy. Home remedies haven't been proven scientifically, but usually they won't hurt you if you want to try them.

Prevent a skin infection
  • Wash the area with soap and water.
  • After washing, wipe the area with rubbing alcohol or first-aid antiseptic.
  • Trim fingernails to prevent scratching, which can lead to infection.
  • Do not break any blisters that develop.
  • If a bite becomes irritated, apply an antibiotic ointment, such as bacitracin or polymyxin B sulfate, and cover it with an adhesive bandage. The ointment will keep the bite from sticking to the bandage. Note: Stop using the ointment if the skin under the bandage begins to itch or a rash develops. The ointment may be causing a skin reaction.
For home treatment of lice, scabies, tick bites or bedbugs, see the topics Lice, Scabies, or Tick Bites or information about bedbugs.
Symptoms to Watch For During Home Treatment

Use the Check Your Symptoms section to evaluate your symptoms if any of the following occur during home treatment:

Insect Bites and Stings and Spider Bites - Prevention

Take the following measures to help prevent bites and stings.
  • Apply insect repellent before going into the woods or other areas where you may come in contact with insects. Use insect repellents according to directions, particularly when applying repellent to children.
  • Apply repellents safely. Some insect repellents can only be safely applied to clothing rather than skin.
    • Use a lower-concentration repellent on children.
    • Do not put repellent on small children's hands, since they often put their hands in their mouths.
    • Wash the insect repellent off with soap and water after returning indoors.
  • Wear light-colored, smooth-finished clothes that cover your body, such as long-sleeved shirts and long pants. Button long sleeves and tuck long pants inside boots. Avoid loose clothes that might entangle a biting or stinging insect. Avoid bright colors. Avoid going barefooted or wearing sandals outdoors. Some outdoor stores may sell clothing treated with a repellant.
  • Avoid wearing perfumed lotions, aftershave, or scented hair products during the warm months.
  • Take positive steps to manage your surroundings.
    • Always close car windows.
    • Do not put your picnic out until you are ready to eat and repack picnic food as soon as you are finished serving.
    • Avoid flowering plants.
    • If you have a severe allergic reaction (anaphylaxis) to insect bites or stings, have someone else mow lawns or clip hedges.
  • Avoid swatting at insects or flailing your arms around them. Instead, retreat slowly and calmly when insects act threatening.
Additional measures include those to:
If you have had a severe allergic reaction (anaphylaxis) to bites or stings in the past:
  • Carry an allergy kit prescribed by a doctor. If you don't have one, talk to your doctor about getting one. Learn how and when to use it, and keep it with you at all times.
  • Wear a medical identification tag to let others know you have an insect allergy.
  • Discuss allergy shots (immunotherapy) with your doctor. Shots may be appropriate to control and prevent your symptoms. For more information, see:
    Allergies: Should I have allergy shots for insect sting allergies?

    Insect Bites and Stings and Spider Bites - Preparing For Your Appointment

    To prepare for your appointment, see the topic Making the Most of Your Appointment.
    You can help your doctor diagnose and treat your condition by being prepared to answer the following questions:
    • What type of insect or spider bit or stung you? Be prepared to describe it.
    • When were you bitten or stung? How many times were you bitten or stung? Where on your body were you bitten or stung?
    • Have you ever had a severe allergic reaction (anaphylaxis) to a similar bite or sting?
    • What are your main symptoms?
    • When did your symptoms begin? How have your symptoms developed, progressed, or changed since the bite or sting?
    • What home treatment have you tried for the bite or sting? Did it help?
    • What prescription or nonprescription medicines have your tried on the bite? Did they help?
    • Have you traveled recently?
    • Do you have any health risks?

    Insect Bites and Stings and Spider Bites - Related Information