Rash/bumps on baby boys scalp!???

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Help what is this? It looks like its gotten worse but hes had it since he was born I cant remember if the midwife said something about burst blood vessels but I'm worried it's something more serious it looks aggressive but doesnt seem to be sore at all hes not bothered by it

Has anyone seen anything like this? Its Saturday so I can't ring the doctors today but I will be doing first thing Monday