Hydroquinone inhibits melanin production when applied to
the skin. The effect is reversible by exposure to ultraviolet
Hydroquinone in 2% solutions is used in many skin lightening
greams and gels to remove freckles, age spots, and other
hyperpigmented areas of the skin.
Since sunlight reverses the effect, a sunscreen is usually
mixed into the preparation.
By Simon Quellen Field