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the plasma of the blood flowing through the numerous dermal blood vessels

The fluid in a blister is lymph. It comes from the lymph system, which is a circulatory system similar to the one that circulates blood. The flow of lymph is powered by the movement of the muscles throughout the body, and the lymph is colorless and nearly clear.

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Q: What is the source of fluid that accumulates in a blister caused by?
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