Skin Care | Your Skin Care

Hi, I am 18 years old and my acne has finally pretty much gone away. But i do have some scars left, and my skin isnt as soft as I want it to be. I have heard about obagi and wondered if it would work for me. Do i have to use it with tretinoin cream? How long do i have to use it for? Are there just a few products i can use for scarring rather than the whole costly kit? Am I too young to even use it? Do the results last even if you stop using the products? Any help would be appreciated.