Why Do I Have Freckles?

Do you know anyone with freckles? Maybe you have freckles yourself! Jessi has them, and she's been wondering what they are, where they come from, and why some people have them and some people don't!
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SOURCES:
http://kidshealth.org/AllegroPediatri...
http://kidshealth.org/en/kids/freckle...
https://www.kidsdiscover.com/quick-re...
http://genetics.thetech.org/ask/ask195