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 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 Sun Spots vs Freckles on Dark Skin What's the Difference? BGS How Melanotan 2 Affects Hair Colour Especially in Red or Ginger Hair Pure MT2