You can get stretch marks from putting weight on quickly or losing it quickly too, if they are still red you can buy products to diminish them considerably, Decleor do one that used to be called gel prolegene but i think it may be now called perfect contour or something alike, clarins also do a tonic oil, cream and shower and bath foam and i am sure there are other product ranges that help with these too, try to go for one that is not dirt cheap if you decide to try one as they don't have alot of natural products in so are not as healing or as potent, you really do pay for what you get when buyinh these sorts of products, anyway hope this helped.