Shoulder Pain with a bump at the top?

I have been going to a football camp for five days and this morning I woke up with some extreme pain on my shoulder. The pain is most prevelant at the top of my shoulder and there is a bump in this area. The bump is also on my other shoulder, but it is much smaller. The bump on my hurt shoulder is painful to the touch and I am pretty sure it is the source of my pain. What is strange is that I did not have this pain prior to going to bed and i can not think of any specific thing that happened during football to cause this. Does anyone know what this could be?