WHAT ARE BLISTERS FOR?

I ran two 4 milers last week and got a gross blister on the tip of my toe. I looked up WHAT ARE BLISTERS FOR?, did not look at photos, and learned that there is clear plasma in there working against infection and allowing the skin to heal. So today I am not running, I am going full beatnik, painting in flip flops and shorts with no shirt, and listening to Sun Ra.