I, too, have stretch marks. I have silvery ones on some areas of my breasts and since they're already matured, there ain't much I can do. But I have tried dermarolling on the stretch marks on my hips which are still fresh, raised, and purple. It hurts and sometimes I ask myself why I make tiny holes in my skin for the sake of achieving beauty.
I roll the needle head on my stretchmark horizontally, vertically, diagonally, in all directions. I used to apply cocoa butter afterwards, but I lost my cocoa butter stick and never got around to getting a new one. It really helped speed up the progress. I had a stretchmark on my boob that I caught nice and early and was able to get rid of it with the cocoa butter and dermaroller in about two weeks.
"Since scars are merely a cosmetic issue, our body does not bother to replace scar tissue with normal skin. Skin microinjuries (which is what needling or dermarolling does) are a clever trick to force the skin into remodeling and regeneration. The microinjuries are not big enough to cause more scar tissue but they are big enough to trigger healing processes and regeneration. Unfortunately, the induced regeneration doesn’t completely replace scar tissue by normal skin; it normalizes the skin only partially."
As you can see, it will help reduce it but you can't get rid of the scar tissue(stretch marks). But:
"Stretch marks are deep scars in the dermis and there is currently no method that can remove them. Dermarolling or needling can very significantly improve the appearance of stretch marks but it cannot make them disappear."
"Significantly improve" is good enough for me!
When you use the dermaroller, be sure to thoroughly spray it with rubbing alcohol. Also clean the skin with alcohol and use an astringent when you're done with treatment.