Just make up a name for a very coincidental case. That way you can proof that it happens only in a few cases.
It is a standard way of Big Pharma to get away with murder.

The blood-spots are caused by the immune system destroying cells in the blood vessels. These vessels will burst and leak out blood.
Dr. Bakdhi has explained this already.

This form of auto-immunity is default for a mRNA/gen based vaccine, because the activated immune system will attack all cells that are producing the spike-protein. Chance is probably higher with healthy young people.

It is not rare. It is just luck, when the cells stop before they can be attacked.
Luck like in Russian Roulette.