In order to effectuate stretch mark removal, sometimes it is easier to eliminate the source of their appearance rather than trying to remove the stretch marks themselves. A case in point.
The authors of this study found that a 14 year old boy had developed stretch marks all over his body. The boy had started taking oral steroids a short time earlier. Such huge stretch marks are very rare, especially when the doses of steroids are not high. While the authors note that widely spread stretch marks are not a serious disease or disability, they acknowledge that it may constitute a major cosmetic problem.
So it's not just pregnancy that can lead to stretch marks. Add oral steroid therapy to your list of things that can cause stretch marks.
The unusually large striae distensae all over the bodyk. Rotsztejn, H., et al Adv. Med. Sci. 1-3, 2010.