Four days ago I noticed a nickel size bruise on my right breast. I haven't had an injuries to it or trauma. Then today I noticed another small bruise about an inch away from the other bruise. They both are growing, and there color has not changed or turned a yellow color like they are going away. What could this be?

A good sign that you need to go and see a doctor. It could be a lot of things and none of them good. I won't scare you with the possibilities but you should talk to a doctor.