Oral frictional hyperkeratosis - Oral Mucosal Lesion
The area is asymptomatic.
This occurs on the maxillary and mandibular alveolar ridges particularly after extraction of teeth, and particularly in the area of extracted mandibular third molars on the retromolar pad area. The alveolar ridge mucosa that had previously been "protected" from food impingement is now exposed to trauma and becomes hyperkeratotic as a protective mechanism.
However, other sites may be affected depending on the circumstance. For example, a sharp or broken cusp that rubs against the buccal mucosa or lateral/ventral tongue may cause an area of hyperkeratosis.
These areas take months to develop and they persist as long as the traumatic events persist.
K13.79 – Other lesions of oral mucosa
235034000 – Oral frictional keratosis
- Leukoplakia – This is the most important differential diagnosis. Because of the premalignant and malignant connotation of leukoplakia, and if you are in doubt, a biopsy should be undertaken.
- Linea alba –This is a form of frictional keratosis seen on the buccal mucosa with a characteristic clinical appearance.
- Chronic cheek chewing (bite injury) – This is another form of frictional keratosis that has a shaggy surface configuration.
- Candidiasis – This is usually acute, tends to be surrounded by erythema, and is usually multifocal in presentation.
- Lichen planus
- Squamous cell carcinoma