i agree with the Sandman
 

the bump "is or could be" scar tissue that grew around it
and that wouldn't happen if you just got an in and then out puncture wound.

Spined
 

This is a very serious topic! I have heard some horror stories of lost limbs , and stories of lost life.I have been spiened a few times and so have people on my boat. I have a first aid kit on the boat and in my van. If some one does get spined everything stops and the kit comes out. Alcohol, peroxide ,and or Bleach,thats rite bleach. I was carless this past season and got a little tip of a spine in my thumb, washed it out and didnt do what I knew I should. It got infected, had to open it up and wash it out with alcohol. My fishing partner got spined real good on the inside of his thigh.I made him stop and open it up and wash it out. He thanked me later when he read up on what can happen. Cuts and slices for some reasom aren't as critical as a spine. Dont take any chances when u get spined and if you catch alot of fish its bound to happen.