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A group of disorders that cause sores or open lesions within the mouth.
Mouth ulcers are caused by many disorders.  These include canker sores, leukoplakia, gingivostomatitis, oral cancer, oral lichen planus, oral thrush, and similar disorders.  The skin lesion of Histoplasmosis may also appear as a mouth ulcer. Aphthous ulcer is most common in young adults, with about a 60% incidence.
Good oral hygiene may help in the prevention of some types of mouth ulcers or complications from mouth ulcers. This includes brushing the teeth at least twice per day, flossing at least daily and regular professional dental cleaning and examination.
A physician or the dentist usually diagnoses the type of mouth ulcer based on the appearance and location of the lesion.  A skin biopsy of the ulcer or blood tests may be needed to confirm the specific causative disorder.
In homoeopathy medicine like Borax, Nit acid, Capsicum  are used for the treatment. The proper analysis of the case with the qualified homoeopathic physician will give the better results.