They can: Freckles can grow with sun exposure. Many people who are freckled will notice an increase in both the darkness and the number of their freckles after they've been out in the sun. Be sure to use SPF when you're out in the sun. If there are "freckles" that don't look like the others, or are changing in shape or color, be sure to see a doctor to make sure they aren't something else.
Answered 8/30/2019
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