By having God do it. It's a common misconception that lasers can circumvent the normal eventualities and exigencies of the healing of the human body. Once a scar is created it is present ever after. The remodeling of the skin can result in one with such a fine line that the typical human can't perceive it at a conversational distance but this has more to do with the skin physiology of that individual than it does w.
Resurfacing lasers. You can never get rid of a scar but you can improve upon the appearance of the scar greatly by using resurfacing or ablative lasers such as co2, fractional co2, erbium:yag, or fraxel lasers.
Probably can't. Laser are helpful in reduction of scar appearance but will not completely remove scars. Seek a laser center near you to determine which type of laser would be best suited for you, and the chance of improvement.
You can't . You can change the color to better match the surrounding skin disguising it better, but the scar will remain.