It Happened Right On Thursday November 26 2015 (thanksgiving). My

It happened right on Thursday November 26 2015 (thanksgiving). My tip of my top middle dinger was selling up. There is a big bubble on the right top of my middle finger and the top behind my nail. It is red and swollen up. Right behind my middle finger nail there is a yellow greenish color slowly spreading to the middle of the bubble. The pain is incredibly bad when any kind of pressure is applied. What could it be, di something bite me or did I just touch something.