Having freckles is a common and harmless condition that is shared among many people around the world. Freckles are passed down genetically, and are a dominant trait. They are most common and most easily seen on fair skinned people. Many people with freckles notice that their freckles become darker after being out in the sun. This is because freckles are basically clumps of melanocytes, and the sun's ultraviolet rays cause melanocytes to create more melanin, making the freckles darker. Now, many people with red hair also have freckles, which is partially because both red hair and freckles come from the same gene. As mentioned in previous paragraphs, pheomelanin is the kind of melanin that is responsible for giving hair and skin a red color.
