Caterpillar sting (stinging caterpillars)

Overview

The puss caterpillar and saddleback caterpillar cause the strongest stings in the U.S.

Pain can spread up the limb.

Symptoms

Common signs:

• Stinging rash
• Bug bite or sting
• Itching
• Red spot, bump, or patch on the skin

Less common

• Swelling

Look up a symptom: Itching · Red spot, bump, or patch on the skin

When to get medical care

Causes

Caterpillar hairs.

Who is more likely to get it

• Children: Most likely to touch caterpillars
• Gardeners and campers: Higher risk

Possible complications

• Hives: Skin reaction
• Pink eye (conjunctivitis): If hairs get in the eye

Diagnosis

A clinician asks about your symptoms and may order tests.

The exam

A physical exam.

Treatment

Treatment depends on the cause and how severe it is.

Self-care

• Use tape to pull off hairs
• Wash
• Ice
• Use cold packs
• Take an antihistamine

Prevention

To lower your risk or prevent problems:

• Don't touch fuzzy caterpillars

Which doctor treats this

• Urgent care or the ER can treat it first. For minor problems, your primary care provider can help.

Back to school, work, or sports

• Most people can go to school or work. Keep the wound clean and covered.
• Avoid pools and hot tubs until the skin heals.

Children, pregnancy, and older adults

• Children: Most likely to touch them.

Outlook

Pain usually fades in a day.

Getting ready for your visit

Bring a list of your symptoms and medicines.

What to bring

• A list of your medicines and supplements
• Notes on when symptoms started and what makes them better or worse

Questions to ask

• What's causing this?
• What treatment do you recommend?
• Do I need treatment?

Research studies

Research studies test new ways to find and treat health problems. Some are looking for volunteers. Talk with your doctor before joining one.

Search ClinicalTrials.gov for studies on Caterpillar sting (stinging caterpillars)