I suffered from acne years ago and now its less than before but it left some red scars. what should i do to get rid of them and acne my skin is oily..?

Still active: It sounds like your acne is still active even though decreased. Also, the scars are still red which means they are not yet completely mature. This is an excellent time to manipulate the way they heal. I love treating these early scars and active acne with a combination of aggressive tretinoin, chemical peels, microneedling and platelet rich plasma. You should see a skin specialist. Be well.