Going through puberty I had some pretty bad cystic acne. Couple that with keratosis pilaris (keratin plugs that usually form on outer arms and thigh areas due to body's inability to fully slough off dead skin cells) and compulsive skin picking, I was left with lots of acne scars and marks on my arms. I obsessed about them when I was younger and researched/tried everything from hydroquinone (skin lightener made of benzene -- nice! (not)) to other various medications, etc, etc.
I finally just left everything as is and let puberty run it course. I'm 24 now and the facial acne scars are almost non-existent and healed well (time really helped), however the dotted scars on my arms are still there. About 2 months ago I was reading stuff about essential oils and what not and stumbled across this site. Tons of good information about making your own blends but I don't have the time right now to make my own so I ordered their pre-made blend. In all seriousness, my arms are looking the best they've ever looked.
Placebo? Maybe. Do I care? No. Give it a shot if you want. I bought the 2 oz. bottle (a little pricy at $31.09) and I am using quite a bit every night (not just a few drops on scars but slathered on my arms). It'll still last me another few months I bet.