Assertion: aphthous ulcer | /r/HasProperty | canker sores
Facets:
Source sentences:
text: The precise cause or causes of aphthous ulcers (canker sores) are unknown, however, it is thought that ulceration is brought about by one or a combination of external triggers.
text: Over-the-counter, topical anti-inflammatory pastes applied directly to the problem area may be effective in managing the symptoms of aphthous ulcers (aphthae/canker sores), particularly of the minor variety.