It’s tough to resist scratching an itch — and evolution may be to blame

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It’s tough to resist scratching an itch — and there might be an evolutionary reason for that, a new study suggests.

People are typically advised not to scratch itchy skin — whether due to a bug bite or chronic condition — because too much abrasion can raise the risk of infection by injuring the skin and may worsen the itchiness. However, a study published Thursday (Jan. 30) in the journal Science found that some amount of scratching may be useful.

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