What can I do for my painful stretch marks?

I got these stretch marks on my inner thighs close to the cheeks when I was into weightlifting. I got this god awful job in the sun walking around all day and after a while, my stretch marks hurt real bad and get red and immflamed. They are on both legs and it is a large long cluster of stretch marks that are dark. Every once in while, I get these cyst like bumps on the marks that you can pop like pimple. What can I do?