Differential diagnosis<unk>  is a descriptive clinical term, not a diagnosis. Dermatologic conditions cause about 75% of cases of<unk> , and over 95% of the dermatologic cases are accounted for by either oral lichen planus or cicatricial pemphigoid. The exact cause of<unk>  cannot be determined about a third of cases. * Oral lichen planus * Cicatricial pemphigoid or less commonly bullous pemphigoid * Pemphigus vulgaris * Linear immunoglobulin A disease * Dermatitis herpetiformis * Lupus erythematosus * Chronic ulcerative stomatitis * Chronic bacterial, fungal, and viral infections * Reactions to medications, mouthwashes, and chewing gum Rare causes include: * Crohn’s disease * Sarcoidosis * Leukemia * factitious (self inflicted) lesions * Squamous cell carcinoma (can be mistaken for<unk>
Desquamative gingivitis
Denture-related stomatitis
Contact stomatitis
Aphthous stomatitis
Herpetic gingivostomatitis
Byssinosis
Angular cheilitis
Actinic cheilitis