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Nell Greenfieldboyce

What can trigger an itch? Scientists have found a new culprit

New research finds that a common microbe may be directly causing itchiness on the skin it colonizes. (Kinga Krzeminska/Getty Images)

If you've got itchy skin, it could be that a microbe making its home on your body has produced a little chemical that's directly acting on your skin's nerve cells and triggering the urge to scratch.

That's the implication of some new research that shows how a certain bacteria, Staphylococcus aureus, can release an enzyme that generates an itchy feeling.

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