First Call from the School Nurse

The school nurse called me one afternoon to let me know that Jacob was in her office. Of course the first thing I did was panic. Jacob had hit his head in PE and had a nice 'little' bump on his head. It took up half of his forehead. She said he didn't cry or freak out or anything. My stomach still churns when I look at these pictures. Can't I just put a helmet on him something? Maybe wrap him in bubble wrap?
(P.S. The pictures don't do it justice. )