Kirsten....that lump could be any of a multitude of things....

and even if...it is the worse thing (which I doubt) my mother had a cat Annie, who had a sarcoma at the injection site. My parents did not choose surgery and still Annie lived many years after the diagnosis.

So do not borrow trouble....never trouble trouble, until trouble troubles you and all those other old says that mean......RELAX! and enjoy your beautiful girls....