Bulbous

I have a swollen left middle finger tip and it hurts plenty. Don't know why, don't know how. It is starting to look like ET's finger except it does not yet glow. The swelling has completed smoothen out the skin around the nail and the finger print has all but disappeared from the skin being stretched so tight. But the constant pain is just annoying and typing shoots bouts of pain up my hand. When I squeezed the first joint just below the swelling, I can see a spot next to the nail which turns pale and extremely tender. Looks like some infection or something but there is no perceptible wound, not even a pin prick. Maybe I accidentally pull out a piece of skin. Slowly, however, the swelling is turning purple. What is going on here? Ow!