I have soft acne problems in my face, my skin is very sensitive , my biggest problem is blackheads , the T zone is oliy but the the rest of my face is has only blackheads but its kind of unhydrated. i want to make a laser treatment. i also have acne scars on my back the are not deep. so i wonder what should i do too remove this marks. how many treatments do i need and what kind of treatment is best for me?