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Blistering occurs when an upper layer of skin rubs against the underlying layer.
當表皮與皮下層相互摩擦時，就會產生水泡。
As a space opens between the skin layers, chemicals cause the blood vessels in the area to leak and allow a clear fluid to seep out and fill the space between layers of skin.
當皮層之間形成隔離空間后，化學物質造成此區域血管滲透，從而有透明液體滲出，填充在皮層之間的部位。
This fluid is a sort of clear plasma, or blood without the red blood cells.
這種液體是一種透明的血漿，或者可以說是沒有紅細胞的血液。
Blisters usually occur in the uppermost layers of skin, and are normally harmless.
水泡通常出現在皮膚表層，對人體無害。
Because the blood vessels are only made more porous but not actually damaged, red blood cells do not fill the blister.
血管只是多了一些空隙，實際并未遭到破壞，紅細胞也不會出現在水泡內。
But if a blister does fill with red blood, it means the damage is more serious, and should be carefully treated.
如果水泡內出現紅色液體，這就意味著血管損傷比較嚴重，需謹慎處理。
譯文來自可可網絡
