Pigmentation
Within our skin we have pigment producing cells. When exposed to sun, stress, irritation or hormones they become over active and produce pigment as a way of our skins natural protection. This can result in pigment build up and an uneven, dull and aged looking skin.
Not only do we want to exfoliate what we can see on the surface, but we also want to inhibit the over stimulation and protect against further over stimulation.