SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/small-ringworm-fungus

What causes ringworm, a skin infection small pets can pass to people?

A fungus, not a worm.

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  1. A tiny worm under the skin
  2. A fungus ✔
  3. A virus from wild birds

Why: Ringworm is a fungal infection, not a worm. In guinea pigs, rabbits and rodents it often shows up as bald, flaky or crusty patches. It spreads by touch and through bedding, so infected pets need a vet and careful cleaning.

Huh, didn't know that: If you must handle a guinea pig with ringworm, wear disposable gloves and wash your hands well after.

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References

Answer: A fungus. Ringworm is a fungal infection, not a worm. In guinea pigs, rabbits and rodents it often shows up as bald, flaky or crusty patches. It spreads by touch and through bedding, so infected pets need a vet and careful cleaning.

  1. About Ringworm, CDC www.cdc.gov/ringworm/about/index.html
    Ringworm is caused by fungi (not a worm).
    Checked 2026-10-11.
  2. Skin Problems of Guinea Pigs, Merck Veterinary Manual www.merckvetmanual.com/all-other-pets/guinea-pigs/skin-problems-of-guinea-pigs
    If you must handle an infected guinea pig, wear disposable gloves and wash hands thoroughly afterward.
    Checked 2026-10-11.

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