What Are Freckles?
1. Freckles and Sun
Since freckles are caused by melanocytes that produce melanin, being exposed to the sun can cause freckles to appear darker. This occurs as the melanocytes produce more melanin in response to the ultraviolet exposure. Freckles are more likely to occur in individuals with fair complexions as they have less melanin. The more melanin, the darker the skin color.
However, some melanocytes make more melanin compared to the others resulting in darker spots known as freckles. In some individuals, when there is less exposure to the sun such as during winter months, the freckles may fade away almost completely while returning during the summer months. Some freckles may persist all year.
