Here we go with proper scar massage (I used to teach that to surgeons). You want to buy a vitamin E containing cream (Walmart has a good one for little money). You smear this onto the scar and the surrounding area. Now you use the flat of two fingers to massage this cream into the scar and the tissue next to it. You want to do this in a circulating manner, followed with a massage across the scar and along the scar! You want to apply as much pressure as possible (but not that it hurts), and massage until most of the vitamin E cream has disappeared. You do this massage 4 to 5 times a day, pro scar at least 5 minutes each time. The goal is to break the scar tissue down. You achieved the goal if you do not feel any hard tissue anymore under the scar, and the scar does not present itself as a weld anymore.
If you did it right, your scar will eventually be seen as a thin white line at the site at which the original incision was placed!
The older the scar is, the harder is it to break down the tissue. Your surgeon should have told you to start massaging the scar as soon as the wound had healed!
Good luck and have lots of fun seeing you scar looking better! (you will get tired, but strong fingers while doing this)