What happens when you smash your finger in a door and it gets swollen and bruised will the nail fall off?

If you have shut your finger in a door or something and it has bled underneath then yes but it will take a while and it will come off bit by bit and dry blood will be uncoverd which u can pick away. This happend to me. You could however go to the doctor and they can burn a hole to let it bleed out the nail if it's to painful. Hope this helped

*sueleen aged 14