Huge, nasty bruise on back near armpit, and severe stomach pains?

Liz

New member
Hi, I'm a pre-teen going into 6th grade, and I have a huge, nasty bruise near my armpit on my back. It is blue and purple, kinda dark. I don't recall of hitting my back to anything. I also have been getting severe stomach pains since I was 3. When they act up, it feels like someone is stabbing me with a dagger, but worse, and I can't breathe because if I do it hurts way too much. What is wrong with me?

If this helps, about one or two years ago I was attacked by a dog. It wasn't too bad, but it was scratched and bleeding.
 
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