When I woke up I could feel him inside me; and he was trying to speak, but I could not. Aristotle muttered something about my tongue being abnormally thick and hard. Hippocrates then forced my mouth open and stuck blistering substances to my tongue to drain away the dark fluid. Celsus shook his head and said: 'All that the tongue needs is a good gargle and a massage.' But Galen, who would not be left out, said my tongue was merely too cold and wet. And Francis Bacon suggested a glass of hot wine.
I personally find this part overly sexualized and I believe it was done intentionally. The description of the tongue is used to show that the environment of the narrator exposes him to constant assaults and what we would consider inappropriate behavior. At the same time the passage could also be interpreted as an example of the character's incompetence of speaking his mind.