Ian cookieless, you type really well for a guy with a smooshed index finger!

A puncture wound is nothing to muck about with. Go see a doctor as soon as possible, for all of the reasons listed above. While you're waiting for the doc to see you, try to immobilize the finger with a makeshift splint in case a bone is broken or some tendons are damaged.

The loss of your nail is the least of the possible complications; it'll grow back.