I used to do it to treat acne scars in my early 20s, and then I lost my derma roller and kind of forgot about it. But I saw one on sale for $10 at Winners so I decided to start doing it again, and even after one treatment my skin is soooo much better. I usually get lots of little zits on my face and derma rolling completely gets rid of those. My forehead is so smooth atm I've heard of people using larger needles for getting rid of fat/cellulite too and I'm thinking about trying it, but I'm sceptical. Has anyone used it for that before?