It could be a spider nevus, or spider angioma. This is a "collection of small, dilated arterioles (blood vessels) clustered very close to the surface of the skin." https://www.healthline.com/health/spider-angioma
It isn't dangerous, but you should let your doctor check it next time you're there, just to make sure.
This has an image of it - https://patient.info/doctor/spider-naevus
There's also spider veins, or telangiectasia.