A clinical differential diagnosis of a chronic, relatively nonpainful ulcer of the hard palate would include all the following except:

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Aphthous ulcers typically do not occur on the hard palate, especially when considering chronic, relatively nonpainful ulcers. They are more common on movable mucosa, not on the hard, fixed tissues. Squamous cell carcinoma, necrotizing sialometaplasia, tuberculosis, and traumatic ulcers can all present as chronic ulcers in the hard palate area.

A Clinical Differential Diagnosis of a Chronic, Relatively Nonpainful Ulcer