Covid blisters. One will find blood clogged under the skin and gone red. Specially in fingers. These will be painful if rubbed on. Like other blisters.
Now this marks another familiarity with plague, sign of which was fingers going black.
In covid not everyone gets it. 1 in 7 only. Add with it not being able to smell anything. That's 1 in 3. And one gets somewhat a higher possibility of detecting if one is infected.
Note that covid induced blood clog happens to young mostly. Old people don't get it. Which is why most of the time you will see young people suddenly collapsing and dying in covid infected areas. Blood clog resulting into heart attack.
Link to covid blister description from BBC in comment.
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- https://www.bbc.com/news/health-52493574