Lasers for leg scars
I see you are in the Philippines. Your genetic background makes you more susceptible to hyperpigmenation after any trauma. Lasers can help, but only if they are done extremely carefully. A fractional laser such as the Fraxel laser can be used, though in your case I would suggest a test section to see what kind of pigmentation response you will get.
You don't say what the scars are from or if they are colored scars or white scars. This may be a deciding factor for your physician in choosing...