What are the white dots in my blister?

Question

Yesterday I wore my new pair of shoes and didn't break them in. A few hours later, I took them off and found a blister on each of my foot in the same place. I didn't pop them or do anything. I wore them again the next day, and after I took them off, I found 5 white tiny dots and 1 large one on one of my blisters.

Answer 1

It sounds like those "dots" are just where the blister popped on its own.  It must have rubbed against your shoes while you were wearing them.