7 août 2023 · In a nutshell, it increases the amount of the red pigment (phaeomelanin) that gingers have, and decreases the amount of the darker pigment (eumelanin) they produce. That's what causes redheads to have fairer skin, freckles, pale colored eyes and, of course, red hair. That's also why redheads have to be careful in the sun, as they're more.