Cold sore contagious?
Cold sores are considered to be most contagious when the blisters have burst open and have begun
Answered -
About Blisters
Blisters are small pockets of fluid in the upper layers of skin. They are caused by friction, burns, freezes or chemicals. The fluid inside the blister, called serum, is usually clear and made of plasma. If a blister becomes infected, they can fill with pus. Blisters that fill with blood? You got it, blood blisters. If you get a blister, don't pop it, the plasma not only provides lubrication but aids in cell division to make new skin.
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