<unk>  affects between 5% and 66% of people, with about 20% of individuals in most populations having the condition to some degree. This makes it the most common disease of the oral mucosa.<unk>  occurs worldwide, but is more common in developed countries. Within nations, it is more common in higher socioeconomic groups. Males and females are affected in an equal ratio, and the peak age of onset between 10 and 19 years. About 80% of people with<unk>  first developed the condition before the age of 30. There have been reports of ethnic variation. For example, in the United States,<unk>  may be three times more common in white-skinned people than black-skinned people.
Aphthous stomatitis
Herpes labialis
Contact stomatitis
Denture-related stomatitis
Bovine papular stomatitis
Oral candidiasis
Adenoviral keratoconjunctivitis
Dermatophagia