hey ive been getting random bruisies on my thighs for the past few months. at first i thought i was just bumping into things but now they are showing up more and more. i have 13 dark bruises on both my thighs right now. about 5 of them showed up over night. im not in any sports and have not done any physical activies that would lead to bruising. i am 17 years old. and i do not bruise easy. what could this be?