Stretch marks!!!?

So I have been using Palmers Cocoa er for maybe 3 or 4 weeks now and it isn't doing anything for my stretch marks on my thighs. I am actually getting more stretch marks. I am very athletic and fit. My thighs are my strongest part of my body. But for some reason my thighs still get stretch marks. Is it something in my diet that is still giving me streatch marks, and is there something else I can do to get rid of them. I don't want to go to a doctor for it. So what can I do to get rid of my ugly stretch marks!?!??!