I agree, why wait? Definately you need to see a doctor. Good chance it is nothing (80%) but you want to be sure. I could only feel my lump when I laid on my back and put my arm over my head. Mine was only 6mm but I found it and had it checked. Good thing I did. I also had very dense, lumpy breasts so it was hard to feel. I had been checked for other lumps several times and they were benign. Please get it checked out asap.
It's only when we truly know and understand that we have a limited time on earth -- and that we have no way of knowing when our time is up, we will then begin to live each day to the fullest, as if it was the only one we had.
Elisabeth Kubler Ross