Can Random Bruising Result In Pain?

Yes I recently seen a doctor for brusing randomly all over my body but mostly on my legs, she ran blood work for all sorts of possibilities and the blood work came back all normal, I dont have an appetitie i could go a whole day without eating or just eat once a day and be satisified, i dont bang or bump into anything but yet i get large size bruises that pop up randomly and out of no where, I also have severe leg pain in my left leg which is the leg that tends to have the most bruises on it, do you have any ideas of what could be wrong?