Aphthous ulcers are small, painful open sores of the oral mucosa, usually grey-white in colour and round in shape. They may occur singularly or in small crops of up to five ulcers. Aphthous ulcers generally heal within 7-14 days. The cause of aphthous ulcers is unknown, but several factors have been implicated, including infection, trauma, stress, nutritional deficiencies and food hypersensitivities.
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