26 yr old, grandson has a nickle size hard, sensetive protrusion on his abdomen, 3"-4" up and to the right of his belly button. He says he's had it for a couple of years, hurts lots when hit or pushed in, ("like a pin in there") has become more sensitive

This. This needs to be medically evaluated. There are several possibilities that it could be, but any abdominal mass needs to be evaluated, especially if it is painful. If he develops vomiting, increased pain, or fever then he needs emergency evaluation.