A Strange “Leaf” on the Floor Nearly Sent Me to the ER — What I Learned About Saddleback Caterpillars and Why You Should Never Touch One Indoors

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How It Got Indoors (And How Yours Might Too)

Saddleback caterpillars normally live outdoors, feeding on leaves of many common plants and trees. But they can end up inside when:

  • carried in on clothing after yardwork

  • hiding on potted plants brought indoors

  • accidentally tracked inside on firewood or outdoor décor

  • blown in during storms

Because they look like harmless plant debris, it’s easy to mistake them for something you can pick up with your bare hands.

What to Do If You’re Stung

While most stings can be managed at home, the pain can be intense. Recommended steps include:

  1. Use tape to gently lift embedded spines from the skin.

  2. Wash the area with soap and water.

  3. Apply ice packs to reduce pain and swelling.

  4. Use antihistamines if itching or swelling occurs.

  5. Seek medical care immediately if you experience:

    • trouble breathing

    • dizziness

    • swelling of the face or throat

    • signs of infection

    • pain that worsens or does not improve

When in doubt, a healthcare professional can provide the safest guidance.

How to Stay Safe Indoors

To prevent accidental encounters:

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