They’re like little blood blisters, tiny, maybe only 1-2mm at most.
I have quite a few at points on my torso, one or two other places.
I first got some when I was pregnant and was told it’s to do with the high volume of blood then but that was 9 years ago and I still get them.
They last for ages but I guess they must go away otherwise I’d have an awful lot more than I do.
Curious 🤔