I have sewn a finger more than once. Luckily the needle did not break into the finger and I managed to miss the bones. I give thanks to wearing acrylic nails for that.
One time, shortly after piercing a finger, I went to the doctor for my regular visit. I told him of my little accident, he examined my finger and said it was healing very well. Then he asked me "When was your last tetnus shot?" Then he explained that the possibility of getting cut with the rotary cutter and pierced by non conventional methods, keeping the tetnus shot up to date is very important.
So, be sure to keep your shots up to date.