Have you ever seen under the nail? I have memory that under the nail, there was winding muscle? construction like large/small bowel and it was not good to see for a while. At that time, I was given first aid.
I couldn't remember how long new nail took to grow. I am sorry that I didn't carefully saw my nail's growth at 7-years old and didn't take any picture. If I have iPhone at that time, I will take many photos and update my nail's growth to twitter.
Posted for Ritsuko