Why do I bruise so easily?

I spent the other night in a hot tub leaning back against a hard surface, and now both of my shoulder blades have huge bruises on them! I have them on my legs and a few on my arms, and I have no idea how they got there. It looks unattractive to wear shorts or anything right now because of my bruises!

Is there a reason as to why I bruise so easily?
 
There are a number of possible causes, including platelet disorders, medications (including aspirin and warfarin), Marfan syndrome, liver problems, being a carrier for hemophilia, etc..
 
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