What is a good peel for dark marks on the body? Ive tried 30% salicylic acid on my knees, butt and back and it just would not take. It works amazing on my face for the same type of marks. I tried Olay Regenerist Microdermabrasion and peel set which has lactic acid, in the past and I love how it made my face feel, but it did nothing for the marks on my face. I need something to get rid of the marks all over my body at any cost. I will try any type of peel on my body, i do not care about pain. Would trying a gel peel make any difference? What is the most efficient way to fade these marks without seeing a doctor?