Ring of dots on babys head

[hrees0111]

My 13 week old baby has had a mark on his head for the last few weeks, not sure what it is- any ideas?
It is the size of the tip of a little finger and is flat. No other issues, he isnt bothered by it, just curious. Could it be a birth mark that I haven't noticed previously?

It looks like a little cluster of blood vessels. My DD has one on her temple, she’s 11 months now and it’s barely visible now as they fade over time :) could get your GP or health visitor just to double check if you’re worried

Thank you Going for vaccinations next week so will ask the Dr then.