I've always bruised easily, and I'm super pale, so it really shows. Then, I started Coumadin therapy about 10 years ago. I think that stopped me from doing much in the BDSM category, though I was still very much interested. My doctor has recently downgraded me to aspirin therapy, so I feel more free to play.
Anyway, yes. I bruise. Horribly. My husband and I are very careful to keep play where bruises can be hidden, since our families don't know about my kink, and are far too conservative to be supportive.