An update on mouth ulcers.
D006801:Humans; D009059:Mouth Diseases / Q000209:etiology*; D012871:Skin Diseases / Q000150:complications; D013281:Stomatitis, Aphthous / Q000209:etiology; D013283:Stomatitis, Herpetic / Q000473:pathology; D014456:Ulcer / Q000209:etiology