Canker sores.
D000293:Adolescent; D000328:Adult; D001361:Avitaminosis / Q000150:complications; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D008297:Male; D012737:Sex Factors; D013281:Stomatitis, Aphthous / Q000188:drug therapy / Q000209:etiology / Q000276:immunology