Plot: Veteran GP Don McKenzie performs a rectal examination, treats a young girl with a marble-sized growth on her forearm, and offers honest advice to a patient who has terminal cancer. Meanwhile, Dr Maria Wallace must bring all of her medical knowledge to bear if she is to correctly diagnose a man whose symptoms include a habit of hitting himself in the face, and Dr Tim King sees a patient with a gum infection that has caused the side of her face to swell up massively