Dear wxy228, This depends at what stage the stretch mark is currently at. Initially they appear purple or red but gradually may fade to a silvery white colour. The purple or reddish colour stretch marks are due to the increased presence of blood vessels in the newly-injured skin. To treat successfully, we use lasers that attack blood vessels and vascular structures. The following lasers could be used include, the V-Beam Pulsed Dye laser, IPL Intense pulse Light lasers and Pulsed Dye- NdYAG combination laser. These lasers can reduce and eliminate the redness of the stretch marks, making them appear less noticeable. The atrophic stretch marks (white or silvery marks) are more mature than the purple and red stretch marks. White stretch marks occur after the blood vessels have faded and the inflammatory response has died down. The following lasers could be used for white stretch marks; fractional resurfacing lasers and radiofrequency devices, including the Fraxel CO2 laser, erbium fractional lasers, the fractional radiofrequency resurfacing Fractora™, InFini RF, IntensiF, INTRAcel and eMatrix. These fractional ablative lasers create small columns of injured tissue from the top right through into the stretch mark. The fractional nature of these devices leaves some of the stretch mark untreated between the columns of fractional injury. This allows for a reservoir of tissue to produce new collagen and elastin to smoothen the appearance of white stretch marks. I hope this information has been of some assistance and best of luck. R. Stephen Mulholland, M.D. Certified Plastic Surgeon Yorkville, Toronto, ON