I often get bruising on my body, usually inner thighs on inside of knee and on arm , on muscle, inner, w what could this be caused f from sometimes small as if someone had grabbed me,often cluster of 2-5 and dark as if from fingers imprinting and large bruises on upper shin light in colors, blue, green, purple, n black and painful.also on inner thighs just about same as ones on arm...what could this possibly be caused from?