https://www.nationwidechildrens.org/conditions/health-library/canker-sores-aphthous-ulcers-in-children
Canker Sores (Aphthous Ulcers) in Children
Canker sores are small sores inside the mouth. They are often found inside the lips, on the cheeks, or on the tongue.
canker soresaphthous ulcersin children