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The oral cavity extends from the lips to the oropharyngeal isthmus. Ulcers of oral cavity can be caused due to viral, bacterial, or fungal infection. Herpangina have a yellow base and red areola around them. Vincent infection spreads to free margins of the gingivae which get covered with necrotic slough.
In erythema multiforme, oral mucosal lesions rupture to form ulcers covered with pseudo membrane. Blood dyscrasias cause ulcerations in the oral cavity and pharynx. Systemic administration of drugs like penicillin, tetracycline, sulfa drugs etc may cause erosive, vesicular or bullous lesions in the oral cavity.