The cure of hot imposthumes is effected in two ways: by the purging of the humour of which the imposthume is formed, and by removing the evil complexion. If the imposthume is caused by choler, it is necessary then to alter the evil complexion; if the imposthume is caused by phlegm, or corruption, then it is meet to give purgings. And Averroes adds a third method here, to remove the antecedent cause.