My 14 daughter is a active in softball at school and travel ball on the weekends. 3 days ago she developed a lump on her left ribs. We thought maybe she had taken a hard hit while catching at a game the night before. Today her doctor did x-rays and said she had stools behind her ribs and for her to take metimucil and if it is not better in 2 days to return and he will do a CT scan. Is it normal to have a lump on the external rib area that is visible to the naked eye?