I was born with two extra fingers on each pinky. it was taken off before i left the hospital, so i have bumps that remain. My grandmother, all of my aunts (except one), and my uncle has one. I am the only grandchild to have one, and I know it is a dominant trait. I dated a guy who was born with one, and I got scared b/c i thought we maybe related way back in the day. I think it helped end the relationship.