Has anyone seen this before?

[Fluffballs]

It's on my 60+ dads arm and he wants to know if it looks like a burst blood vessel? This is the third one that's appeared. Looks just like a scratch or burn but the skin isn't broken it's just a red mark under the skin, no pain at all. Doesnt remember knocking or scratching it.
I've told him to ask a gp but he says they just disappear again before he gets there, hence me taking photos from now on.
Any ideas?
Apologies for grammar, rushed post while holding baby.

[BlackInk]

My mum is in her 70s and her skin has done this for a long time. I think as you age your skin just gets thinner. Any little scratch or bump comes out like this. It's worse since she started taking blood thinners following a stroke. As far as I know it isn't anything to worry about. She's also a smoker, which I think also thins the skin.

[Fluffballs]

Ah he is also a heavy smoker! Thank you