Before weight training, I was always the little guy. I was pretty tiny, back when I was about 16, I only weighed 145 pounds. I was always agressive at what I've done, I played football, but am a hard gainer. I'm 19 now, and avid weight traniner, and weigh 205 pounds at 6'1. Because I was so tiny before, I have stretch marks on my arms/underneath, and chestlike area's. I know they are permanant, but is there anyway of treating them?