Accutane (Roaccutane in UK) does not help with scarring,it should stop further scarring if it cures your acne.

No Sam is right, you need treatments for the scars. Laser is used on the body for this as it's a thicker area and harder to treat. For reds / browns / discoloration v-beam is used, excel v, ipl, or 1064nm. Dilute steroids injections are used for raised scars