Medlite C6 adn Revlite Lasers are best for treating stretch marks.

Stretch marks or striae, as they are called in dermatology, are a form of scarring on the skin with a silvery white hue. They are caused by tearing of the dermis, and over time can diminish but not disappear completely. Stretch marks are the result of the rapid stretching of the skin associated with rapid growth (common in puberty), weight gain, pregnancy and obesity. Although the skin is fairly elastic, rapid stretching of the skin will leave permanent stretch marks. They first appear as reddish or purple lines, but tend to gradually fade to a lighter color. The affected areas appear empty and soft to the touch.