I had a rather spontanious thought the other day. In the wizarding world, we know that photographs can move and that illistrations can move, but I wonder about tattoos. In the movies, we see that Sirius has a great many prison tattoos, but what I wonder is if wizarding tattoos can move the way other wizarding images can.
It certainly wouldn't make it very easy to hide if they did. A person could be in the middle of a job interview or dinner with their parents, and suddenly a Peruvian Vipertooth flies across their face and down their neck.