Keeping a scar moist helps. Aloe Vera may help. Just buy a plant at the local grocery or flower shop, cut off a bit and rub the juice on the scar several times a day.
Otherwise Vaseline intensive care lotion, the white stuff, will do a good job of keeping skin moist.
Vitamin C is very important for skin health and zinc is important for healing. Vitamin D is also very important. Be sure you are taking all of them daily.