Freckles develop when specific skin cells produce extra melanin in response to sunlight. When ultraviolet rays reach the skin, melanocytes release melanin to protect deeper layers from damage. In some people, certain clusters of melanocytes respond more strongly than others. These active clusters produce concentrated deposits of melanin that appear as small brown spots called freckles. Freckles form more easily after repeated sun exposure. Each time ultraviolet rays stimulate the melanocytes, th