I need help

Ok, guys, i need help. I know this might not have anything to do with this app, but I'm so desperate to what is wrong with my finger. 
The symptoms are: redness,swellnes it hurts when I touch the bump. It's been the for more than a week and a half. 
I have looked up in Internet and everything, but I really can figure out what it is. 
Does someone here, can think about what can it be?