Please confirm that you are not located inside the Russian Federation
The link you have selected will take you to a third-party website. We do not control or have responsibility for the content of any third-party site.
Enter search terms to find related medical topics, multimedia and more.
• Use “ “ for phrases
o [ “pediatric abdominal pain” ]
• Use – to remove results with certain terms
o [ “abdominal pain” –pediatric ]
• Use OR to account for alternate terms
o [teenager OR adolescent ]
This photo shows a minor aphthous ulcer (commonly known as a canker sore) on the inside of the lip. The ulcer shown is larger than a typical canker sore.
R P. MARAZZI/SCIENCE PHOTO LIBRARY