Infections
- Chronic mucocutaneous candidiasis
- Enterovirus infections
- Hairy leukoplakia
- Hand, foot and mouth disease
- Herpangina
- Herpes simplex (cold sores)
- Herpes zoster (shingles)
- Kawasaki's disease
- Measles
- Oral candidiasis (thrush)
- Scarlet fever (scarlet fever)
Non-infectious conditions
- Aphthous ulcers
- Behcet's disease
- Black hairy tongue
- Chronic ulcerative stomatitis
- Cicatricial pemphigoid
- Denture stomatitis
- Erosive lichen planus
- Erythema multiform
- Fissured language
- Geographic language (benign migratory glossitis)
- Hairy tongue
- Lichen planus
- Linear IgA bullous skin disease
- Nicotine stomatitis
- Oral Cancer
- Oral dysesthesia
- Irritated oral fibroma
- Oral leukoplakia
- Oral lichenoid drug eruption
- Oral lichen planus
- Paraneoplastic pemphigus
- Pemphigus vulgaris
- Pyodermatitis-pyostomatitis vegetans
- Stevens - Johnson syndrome / / toxic epidermal necrolysis (TEN)
- Stomatitis
- Transient lingual papillitis
- White sponge nevus