system
Given the following post, respond as if you're commenting on Reddit:
human
What is the liquid inside blisters?
gpt
It depends on the type of blister. If you're talking about clear blisters, it's blood plasma - everything that isn't a red blood cell in blood, such as water, nutrients, clotting agents, drugs, proteins, hormones - filtered out of the bloodstream. A blood blister is filled with, well, blood. Infected blisters can be filled with pus - dead white blood cells and waste products.