What are freckles made of?

People all over the world have little brown dots called freckles on their skin. You might notice that you get new freckles if you spend time out in the sun. So what are the deets on these dots? We asked dermatologist Kristen Kelley to help us find the answer. Got a question about something and you need help connecting the dots?  Send it to us at BrainsOn.org/contact, and we’ll help spot the answer. See omnystudio.com/listener for privacy information.