4 doctors weighed in:
Will my black nail grow back normally? Slammed car door on it.
4 doctors weighed in

Dr. Richard Feinstein
Dermatology
3 doctors agree
In brief: Blood under nail
If you hit your skin very hard, it will damage small blood vessels in your skin, and you will get a bruise, where blood has leaked from the veins into the skin.
If you hit your finger nail very hard, you will get bleeding under the nail, which may lift your nail up. There is no where for this blood to go, and the black, old blood, will remain until the nail grows out and it may take months.

In brief: Blood under nail
If you hit your skin very hard, it will damage small blood vessels in your skin, and you will get a bruise, where blood has leaked from the veins into the skin.
If you hit your finger nail very hard, you will get bleeding under the nail, which may lift your nail up. There is no where for this blood to go, and the black, old blood, will remain until the nail grows out and it may take months.
Dr. Richard Feinstein
Dr. Richard Feinstein
Thank
1 comment
Dr. Otto Placik
Make sure you do not have an associated fracture which can also cause a nail deformity.
Get help from a real doctor now
Dr. Christopher Crosby
Board Certified, Dermatology
12 years in practice
93K people helped
Continue
108,000 doctors available
Read more answers from doctors