I've never bruised myself with pumping before. However, arnica used topically is great for bruises (and those red dots which broken capillaries, just as bruises are).
I get little bruises all the time and I'd say I bruise pretty easily, but I can't imagine pumping so hard that I'd get a bruise. I've seen your post-pump progress photo that you posted recently
o by the way), and you appear to have a lot of redness both on your breasts and around where the rims press. In my first month or so, I looked about the same after pumping. Now, though, I never pump so strongly that my skin is red after I take the domes off. I still get great in-cup and post-pumping swelling, but no redness or dots. I'd say that if you ease up on the pressure (even more if you must) and/or the length of time, number of sessions etc, that you won't be getting all bruised up anymore. Based on that photo, it would seem to me that the pressure still may be too much, but - of course - you know your body better than I do!
You may also want to look into getting the foam rings from Noogleberry or using the various other padding methods the folks here have come up with (poster tack, weather stripping/camper mounting tape, yoga mats, and so forth). Good luck to you and I hope your bruises get better soon!