I got a lump in my shoulder that hurts. Suck it up bro.
I would say this...after a while you will definatelly know what is normal and what is not. You just have to live it to know. I would say your good. Although the fact that your saying its getting bigger does not seem cool. If its the same size and not red or hot and just feels all hard like a lump ( knot)....when you press on it its probibaly a knot. Those suck and take a boatload of time to clear. 3-15 days. This tends to happen in scar tissue from what i have noticed. Again if you feel something is not right go to a doctor. It helps to have someone experienced look at it. When i was starting..this realy helped. Just go to the gyma and ask one of the big guys to see your ass

Just make sure you let them know what for so you dont get killed.