um... mines used to bleed if I put anything irritating on them or shaved over them (I have them on my thighs, back of knee area, upper arms by arm pits,- yeah my body is a mess) Sometimes they didn't bleed and just looked like blood was underneath them, sounds gross I know. Depending on your skin type, if it's stretched that much (and depending on how quickly), the skin is thinned out.
Some of mines have faded a bit, others are still pretty much the same.. I don't think they really get worse as you lose weight, unless you are yoyo dieting. What might be happening is you are becoming smaller, and maybe the skin isn't catching up as quick and the marks are over less area and the stretched skin can make them look worse.
Doesn't hurt to put some cocoa butter, olive oil and shea butter on them (one or a mix). They are pretty cheap and nothing to lose by trying them. I read keeping them moisturized help them heal. I also like to scrub/exfoliate mines in the shower with this wash cloth I got from the bodyshop
... I scrub the areas till they get slightly red and then when I get out of the shower I put the cocoa butter or some good lotion on, it makes them look better and more faded for a while and hopefully will fade them permanently.