Why Do I Have Stretch Marks? Dear BeingGirl Experts, I have stretch marks in certain areas on my body, like around the hips. They're very light but they're annoying. I'm not fat or anything, so what are these things? Samantha --- Dear Samantha, The good news is , you are not the only girl who is experiencing stretch marks. During puberty, many girls get them on their breasts, on their hips and thighs, and even on their buttocks. The marks appear because you are growing so fast that your skin can't keep up with the changes in your body, and has to stretch to accommodate the increase in size. The bad news is that there really isn't anything you can do to make them go away. What will happen over time is that they will begin to fade and eventually you will hardly see them. No creams, etc., can make them go away! You can also use body makeup to try to camouflage the lines if they show through your clothing. Good luck in the future! BeingGirl Experts Wondering why do I have stretch marks? Get answers from the experts at BeingGirl.com.