It is a frequent, acute disease which affects all of the mucosa with the exception  of the gingivae and the hard palate (attached tissue).  It presents as superficial erosions or ulcerations, round or oval, of about 2 to 5 mm in diameter, with a yellowish tint due to necrotic tissue and surrounded by an inflammed, reddish halo.  They appear in variable numbers, are very painful, and cure in 8 to 10 days without scarring, only to reappear at a later time.  Their etiology is unknown but is related to emotional stress, menstruation, digestive conditions, microbial or food allergies, autoimmune mechanisms, and others

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