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You may have spotted these odd, tiny caterpillars clinging to your walls or furniture—especially in warm, humid homes. Don’t be fooled by their small size: the plaster bagworm (also called the household casebearer, Phereoeca uterella) can leave behind bruises and itchy, painful bumps.
What Are Plaster Bagworms?
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Species: Phereoeca uterella is a moth found in warm, humid climates, especially throughout the southern United States.
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Appearance: The larvae live inside flattened, case-like cocoons made of silk mixed with sand, dust, and soil. You’ll often find these cases attached to walls, corners, or even furniture.
Why Do They Cause Bruises and Itching?
If you come into contact with these caterpillars:
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They can leave behind needle-like “hairs” on your skin.
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These hairs trigger itching, bruising, swelling, and sometimes severe pain.
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The marks and itching can last for weeks.
Tip: Apply anti-itch cream or ointment to relieve symptoms if stung or bitten.
The Life Cycle and Habits
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The larvae mostly stay hidden inside their protective case, only coming out partially when searching for food.
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Each moth can lay up to 200 eggs per cycle, leading to plenty of new cocoons hidden in warm, sheltered spots.
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Bagworm larvae feed on cloth, spider webs, and even small spiders.
Where Do They Hide?
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Bagworms love warmth and humidity.
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Common hiding places include:
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Behind furniture
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Inside closets
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On walls, especially in warmer areas of your home
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Prevention Tips
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Check hidden and warm spots in your house regularly.
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Clean and vacuum often to remove dust and possible cocoons.
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Watch for signs of fabric damage, especially in closets or areas with stored clothes.
Even though they’re tiny, plaster bagworms can create big discomfort if left unchecked. Keeping an eye on your warm, hidden spaces can help keep your home—and your skin—safe from these surprising little pests. Sometimes, a quick sweep or extra attention is all it takes.
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