Children often get superficial blood vessels like these. Sometimes they go away over time. Kids aren't usually bothered by them very much. They can be lasered off very easily and safely. This isn't very painful and just takes a second, but that's a hard concept to get across to a 7-year-old. Why not have your pediatrician check it out, and then you can take treatment under advisement. Most of the time, though, people decide to wait it out.
Best.
Dr. Rockoff