Stretch marks/discoloring

I need advice how to get rid of or really fade my stretch marks (I gained 20 pounds in toe years so they got darker). When I ran they were really light and didn't bug me but now they do. And because I was a runner with bodacious thighs I always have chaffing problems and the inside of my thighs are darker and I'm really subconscious about it. Any products that are good with this?