I hurt my finger at football practice, like a month ago. The reason I haven't payed much attention to it is because i had major knee surgery. After the knee surgery when I was on pain meds. and etc. It was not hurting, but I went to church the following week and shook somebody's hand and my third knuckle on my right hand was popping as he shook my hand. My knuckle and all the way down to my fingertip is been in bad pain. Also there is a big purple vein that you can see running from my knuckle down to the middle of my finger. It may be nothing, but I just wanted to make sure.