The most common form of mouth ulcer is aphthous ulcer .It can be large ulcer or minor ulcers.Cause are allergies ,stress,citrus caustic foods,underlying folic and b12 deficiencies.Treatment inclued local anesthetic creams ,supplement of folic and b12,Using mouth wash with chlorhexidine and in severe cases oral steroid applications.Some other ulcers like herpetiform ulcers and chicken fox ulcers which appear like red yellowish blisters appears in mouth before chicken fox or herpes rashes appear on skin.In such cases medical treatment is required.some time ulcers cause by HIV and cancer.
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