aphteThe ulcer is a whitish lesion (ulcerous stomatitis) with red circumference, being able to develop on various tissues of the mouth.

This lesion persists from 7 to 14 days, doesn’t affect at all the teeth or the supporting bone of the tooth. The ulcer usually appears after a trauma, such as an injury with hard food or object, or after a high fever. Some people are however affected periodically without any trauma.