I have been a consistent weight for a few months after gaining about 40 pounds prior but I've recently gotten A FUCK TON of stretch marks. All over my butt, down the backs of both thighs going up into my butt cheeks and vagina area, all down my hips and sides of my legs and inner thighs to my knees and calves, my breasts and the backs of my arms. I'm 18 and only weigh 170 pounds and this I just don't understand! So frustrating!!! Why is this happening to me?