Picture quiz: Oral white patches
A 46 year old woman presented to her general practitioner with a history of painful oral ulcers. On examination of her mouth, her doctor saw a white patch on the floor of her mouth (fig). The general practitioner referred her to the local oral medicine department for further investigation and treatment. She was taking no drugs. She smoked 25-30 cigarettes a day and drank 20-22 units of alcohol a week.