When skin gets inflamed for whatever reason (pimples, acne, sunburn, cuts) hyperactivity of the pigment forming cells becomes exaggerated. Some residual discoloration may remain after a pimple resolved. This is called dyspigmentation. With repeated inflammatory events this dyspigmentation may worsen due to overstimulation of the melanocytes (pigment forming cells) leaving permanent dark spots that may be very difficult to treat. This condition is called PIH or Post-Inflammatory Hyperpigmentation. The EVOLOGIE skin care line contains natural ingredients that effectively block the enzyme that hyperactive melanocytes need to form pigment. In this way the continued use of EVOLOGIE STAY CLEAR helps prevent and improve existing ugly dark spots.