Subungual hematoma; left index, how long until nail falls off? lots of blood accumulating under nail. black in colour. severely painful and swollen.

Trephination: Ouch! Go see your family doc about this condition, the sooner the better. S/he can make a hole (trephinate) in your nail allowing blood to escape, thus relieving pressure & pain. No anesthesia needed. Instant pain relief w/very dramatic release of blood build up. Check out http://emedicine.medscape.com/article/82926-overview for more info.