A lesion in the mouth.
About 10% of the population have a harmless mouth ulcer at any moment. Oral cancer is also quite common.
Basically runs down to two conditions:
- Ulcers - Very common, and most commonly completely harmless. Any ulcer that hasn't healed within 2 weeks should be immediately investigated as it could be...
- Mouth cancer - The first presentation of mouth or tongue cancer can be hard lumps, ulcers and white patches - leukoplakia.
We think it is unlikely that as a medical student you will be expected to know much about all this. Learn about ENT cancer, and know that aside from that, other mouth lesions are likely to be harmless.