Oral ulcer; Stomatitis - ulcerative; Ulcer - mouth
Mouth ulcers are sores or open lesions within the mouth, caused by various disorders. (See also mouth sores or canker sores)
Mouth ulcers are caused by many disorders. These include:
The skin lesion of histoplasmosis may also appear as a mouth ulcer.
Canker sores are more common in young adults than in children or older adults.