I got a spot under my big toe, d doc bore a whole and it bled, what do u think about this?

Sounds right: Blood gets trapped under a toenail for many reasons. Minor injury is the most common, but i also see it in runners and people who wear shoes that are too tight. The bleeding under the nail causes the discoloration. Making a hole in the nail lets out the trapped blood.

Wart?: Did the dr. Give a diagnosis? Sounds like it could be a plantar wart. Was the spot dark in color? See a specialist like a podiatrist or a dermatologist.