The ones on my arms are pretty faint, since they were only token SI. Foundation covers them. Apply a good moisturiser first, since the foundation will take better that way. If you don't want them to run in bad weather a mineral foundation works very well, you can apply it over a liquid one to make double sure. I also have some circular scars on my breasts, which I can't cover up, but nobody's looking there anyway.

If the foundation doesn't work I think you'll just have to let your doctor see them.