Buy yourself some Bio-Oil from the chemist/Holland and Barrett and studiously apply it twice a day to the scars. I have keloid scars which have resisted all types of treatment to get rid of them and just by chance I tried Bio-Oil 9 weeks ago. I have noticed a huge difference in the redness and lumpiness of the scars. Im a happy bunny as it also stops them itching when rain is due.
I would suggest going to a beauty salon, where you can talk to a registered skin technician as the best treatment will depend on your type of scars, how deep they are and the condition of your skin. Please talk to a specialist before doing anything as you could end up with worse problems than the scars if you choose the wrong method - I have a friend who had clinical facial blemishes as a teenager and had an atrocious skin but as she has gotten older her skin has naturally repaired itself to a large degree through her using good cleansing and moisturising routines and at 35 it looks so much better than it ever has before so you may not need anything invasive.