Mederma does claim that the scar cream is effective on older scars if used for a period of 3 to 6 months. There is no scar cream available that permanently removes scars, but Mederma can reduce the appearance or texture of large and small scars.
People with old scars can begin using Mederma right away. The product should not be used if a scar is tender, raw or still exhibits a scab or open wound. Mederma works to help smooth the skin, improve discoloration caused by scarring and help improve the overall appearance of the scar and the skin surrounding the scar.