MedlinePlus Medical Encyclopedia: Caterpillars

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Caterpillars

Contents of this page:
Definition Symptoms Home Treatment Before Calling Emergency	Poison Control, or a local emergency number What to expect at the emergency room Expectations (prognosis)

Definition

Caterpillars (long, fuzzy, segmented insects) are unable to pierce the skin with their bite. However, their hairs may become embedded in the skin or eyes, causing symptoms confined to the area of the penetration.

Some caterpillar hairs can be released into the air, where they can be inhaled causing respiratory irritation. Eating caterpillars may cause an upset stomach.

Symptoms

Body as a whole:

Swelling
Pain
Anaphylaxis (rare)

Skin:

Rash
Redness
Itching
Hives
Blisters

Eyes:

Pain
Redness
Tearing

Respiratory:

Rhinitis
Cough
Wheezing
Shortness of breath

Gastrointestinal:

Vomiting, if caterpillar or caterpillar hairs are eaten

Home Treatment

The objective is to remove irritating caterpillar hairs. On skin, apply adhesive tape (such as duct or masking tape) to the site, then pull off. Repeat as needed until all hairs are removed. Follow with calamine lotion, and apply ice to the affected area.

Eyes should be flushed immediately with plenty of water before seeking professional medical care. If respiratory symptoms develop following inhalation of caterpillar hairs, administer beta-agonist inhalers or antihistamines (if available), then seek professional medical care.

Before Calling Emergency

Before calling the emergency number determine the following:

Patient's age, weight, and condition
Identity of the caterpillar, if possible
Time of the incident

Poison Control, or a local emergency number

See Poison Control Centers for telephone numbers and addresses. Poison Control may instruct you to go to the hospital for further care. If possible, bring the caterpillar to the emergency room for identification. If an emergency situation exists, call your local emergency number, such as 911.

What to expect at the emergency room

Emergency treatment may include:

Treatment for anaphylaxis if required.

Skin exposures:

Ensure all hairs are removed
Topical or oral medications to control pain and itching

Eye exposures:

Flushing eyes with water or saline
Topical anesthetic drops
Detailed eye examination

Inhalation exposures:

Supplemental oxygen
Inhaled bronchodilator medications
Antihistamines

Expectations (prognosis)

The outcome is generally very good, and death is exceedingly rare.

Update Date: 4/16/2004

Updated by: Cherlin Johnson, M.D., Department of Emergency Medicine, University of Southern California, Los Angeles, CA. Review provided by VeriMed Healthcare Network.

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