I would definately check with your doctor just to be sure it isn't something else causing the bruising, especially if they've been there for a while and are getting new ones.

On a side note, I once started getting strange little bruises on my shins ( at the time I was also slightly anemic too) and I couldn't figure out where I'd gotten them from. Well one day while making the bed (a water bed with those nice wooden sides) I realized I'd been locking my legs and leaning in with my shins braced on the wood to reach the far side of the bed without having to crawl on the bed (it was against a wall so I couldn't walk around it). So that answered the where part for me. lol