Mine were bright purple, but now they are white and shiny and not very noticeable. Keeping your skin well moisturised might help their appearance a little, but as Glory says, the skin is torn, and can't be mended. I personally wouldn't try any of the cosmetic procedures, once you start your basically committed to having top ups for life, as none of them offer a cure, just a temporary treatment, and it gets expensive. And no one knows the lifelong effects of having these treatments yet.
The ones I really hate are under my arms! Eek! Those ones still are a bit purply looking, but they're getting better as the weight goes down.