[Pontiac]

Maybe from lack of oxygen

Excellent thought.

Since the COVID=19 virus attacks red blood cells those dying cells may end up becoming bunched up in surface capillaries in the extremities.

In most cases I have been reading about the dying blood cells pool in the lungs. But why not elsewhere as well.

[tinyowl]

Wouldn't the mechanism be more like hypothermia where it's not so much dead cells bunching up in extremities but the brain pulling the blood away from extremities and sending it where it's more important?

(Not an expert, not a doc - that's just want first occurred to me)