This website tells you about genetic and sun causes of freckles.
I had to include this because I have a dot in my eye and I never thought that it was a freckle. This website tells you how you get them.
This website tells you about the gene for freckles and how it works to give you freckles.
I chose this article because it gives you a lot of information and explains how you get freckles and does that all with details.