The Difference Between Moles, Freckles, and Cancerous Spots 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 Melanotan II in Santa Barbara, CA Eternity Health Partners Melanotan What It Is and Its Relation to Skin Cancer PDF] Changes of melanocytic lesions inducedby Melanotan injections and sun bed use ina teenage patient with FAMMM syndrome Semantic Scholar Photographs of people with freckles highlight their beauty National Geographic