Fraxel is one of the best ways to treat complications that have to do with the skin. Severe scars and irregular pigmentation can improve with 3-6 sessions of Fraxel. Hyperpigmentation is a result of light sensitivity in deep dermal layers. The pigment tries to block unwanted light from further irritation of these cells. When the pigmentation is removed by laser, the skin will try to add more pigment. This is why many will show more unwanted pigmentation after laser (which is a concentrated form of high intensity light itself). There are methods to ease the sensitive cells so they will not react as they did, but this needs careful conditioning and protection of the deep layers.
Disclaimer: Results may vary from person to person