There are topical prescriptions, like creams with silicone, which may reduce the thickness of scars. Cortisone injections might also help. When a scar is indented, a doctor can use soft tissue fillers, like collagen, to fill out the area, but these injections must be repeated periodically. Dermabrasion can be used to "sand" the layers of skin and make it more even. The scar most likely won't disappear completely, but its appearance should be reduced.