Father Surprises Son With A Tattoo That Matches His Birthmark Derek Prue Sr. learned that his son Derek Prue Jr. was extremely self-conscious about his birthmark that covered a large part of his upper left torso. Like any parent, when Derek Sr. learned that his son was hurting, he wanted to find a way to help. So, he decided that he would get a tattoo that matched his son's birthmark so that his son wouldn't feel so alone. He kept the tattoo a secret from his son during the 6-week process. When asked what he thought about the tattoo Derk Jr. said, "I was happy...I didn't know that he was going to do it."