Definitions for "Aphthous Ulcer"
a shallow erosion with a yellow-white center surrounded by a narrow, red ring
A painful sore in the mouth or throat; also called canker sores.
a small often painful shallow lesion on the mucous membranes lining the mouth, esophagus or rectum. Recurrent aphthous ulcers (RAU) reappear frequently and are refractory to treatment.