Injured Himself With Brain Swollen, Skull Cap Missing. Put Back, White Spot Seen That Leaks Blood. Will It Cause Infection ?

My father injured himself almost four years ago. Smashed in skull had to release pressure cause his brain swelled turns out he had a stroke which caused the fall and injury. After approx seven months in hospital. He came home with a peice of his skull cap missing eventually it got put back in. A few months after that where the skull pei e was put back it concaved in and appeared to be bone coming almost through the skin. It has been a few years now with this little white spot just below the hair line on the top left of his head three days ago it exploaded clear with a little blood. Its been leaking on and off for three days and tonight it shoot out yellowy green puss and theres a hole just a little bigger then a pin size. Could this be weakness in the skull leading to leakage and infection. Should we get him to the hospital....