What causes an itch?

Question: I always wondered where itches come from. Just random itches. Not from bug bites or poison or stuff like that.

Answers:
The feeling of itchiness can be caused by a movement of hairs or the release of a chemical (histamine) from cells under the skin.

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uum.... dirt?....there's no way itch can come up w/out any reason..umm..there's .irritation,.allergy..

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