Hello, I understand your concern for stretch marks. To tell you about stretch marks or medically known as Striae are formed due to stretching and atrophy of the skin. Our skin has its resilience and tensility due to the collagen layer in dermis. Due to abrupt and sudden increase and decrease in weight the dermal collagen gets atrophied and therefore there is formation of stretch marks. In my patients I suggest them to apply Tretinoin cream over the area. Tretinoin causes induction and formation of collagen tissues to build up new collagen and therefore fading of the marks. Derma rollers are also latest modality along with laser therapy but are quite costly in practical approach. All the best.