Assertion: aphthous ulcer | /r/HasProperty | oval
Facets:
value: typically
type: DEGREE
Source sentences:
text: An aphthous ulcer is typically a recurrent round or oval sore or ulcer inside the mouth on an area where the skin is not tightly bound to the underlying bone, such as on the inside of the lips and cheeks or underneath the tongue.
text: They are small, round, or oval and are less than 10 mm across.