Why scratching a mosquito bite makes it so much worse, according to science

Scratching a bug bite or rash may seem irresistible, but it’ll only provide temporary relief and likely prolong the itch, researchers found.

Scratching is a natural response to a skin irritant that increases skin inflammation and can make certain diseases, such as eczema, worse. 

But why scratching exacerbates swelling and whether the evolutionary response offers any benefit is something University of Pittsburgh researchers said remained "poorly explored."

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