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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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What is a fluid filled sac on a finger?

A fluid-filled raised area on the skin of a finger (or anywhere else on the body) could be a blister. A blister can be caused by a burn or by repeated rubbing, such as blisters on the feet caused by shoes that do not fit correctly.

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Does the skin blister when short of oxygen?

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