What Causes Bruises On Legs And Lower Abdominal Cramping?

I am a 20 year old female. I have been very healthy most of my life. I have recently been having bruises on my legs that will not go away. But I have not been exercizing at all. I have two bruises that have stayed for 8 months. They remain the same size, and they don't hurt. In the past two months I had more bruises show up and stay. I don't remember hitting my legs on anything. They just show up. My oldest bruise is the only bruise that happened that I knew where it came from. I have some bruises that show up and go away. But I still have others that won't. The ones that stay are located just above my knee to my ankle.



I went into the doctor, and it's not varicose veins--my veins are perfectly normal. I also had a ton of blood draw (9 tubes), and my blood is normal. They also discovered when I went in that I have a heart murmur. I had an echo done on my heart, and they said my valves were working pretty normal, I just need to go into the doctor once a year to keep an eye on it.



Every now and then I will have abdominal cramps. I've also had intense lower abdominal cramps after I work out strenuously (I used to work out a lot). Those cramps are very different from the side cramps people usually get when working out. They would last for about a half an hour. I could hardly move when they happened. I've had those type of cramps since 7th grade--but they used to be spaced out to a yearly basis or so, now they occur more frequently when I work out.



Do you know what this could be?