Recurrent aphthous ulcer.
D000293:Adolescent; D000328:Adult; D003581:Cytodiagnosis; D005260:Female; D006094:Gram-Positive Bacteria / Q000302:isolation & purification; D006801:Humans; D008297:Male; D012008:Recurrence; D013281:Stomatitis, Aphthous / Q000175:diagnosis* / Q000209:etiology / Q000382:microbiology / Q000473:pathology; D013315:Stress, Psychological / Q000150:complications