Variation of practitioner's difficulties in diagnosing and managing the pathologies of the oral mucosa according to sex, hospital activity and continual education. (a) Difficulties of diagnosis according to gender, hospital activity and continual education. The white zone represents the category with the least difficulties, the light grey zone intermediary difficulties and the dark grey zone the most difficulties. (b) Difficulties of management according to gender, hospital activity and continuing education. The white zone represents the category with the least difficulties, the light grey zone intermediary difficulties and the dark grey zone the most difficulties.