Congenital malformations, deformities, and chromosomal abnormalities (Q00-Q99).
- Dyskeratosis follicularis
- Nevus spongiosus albus (white sponge nevus)
- Palmar plantar keratoses
Skin and subcutaneous (L00-L99)
- Discoid lupus erythematosus (DLE)
- Lichenoid reactions – lichen-like skin changes.
- Oral lichen planus (OLP)
- Pachyderma – mechanically irritative leukoplakia.
Infectious and parasitic diseases (A00-B99).
- Oral candidiasis (candida stomatitis, oral thrush).
- Diphtheria
- Syphilis (Lues) – Plaques opalines
Mouth, esophagus (esophagus), stomach and intestines (K00-K67; K90-K93).
- Irritative hyperplasia of the edentulous alveolar ridge (due to dental prosthesis).
- Recurrent oral aphthae
- Erythroplakia
- Erythroleukoplakia
- Friction keratosis (friction-induced hyperkeratosis).
- Irritative hyperplasia of the oral mucosa.
- Leukedema (oral cavity epithelium, tongue).
- Leukokeratosis nicotinica palati (smoker’s palate).
- Morsicatio (lip biting, cheek biting, tongue biting).
- Oral hair leukoplakia
- Oral submucous fibrosis
Musculoskeletal system and connective tissue (M00-M99).
- Scleroderma
- Systemic lupus erythematosus (SLE)
Neoplasms – tumor diseases (C00-D48)
- Carcinoma in situ within the leukoplakia.
- Bowen’s disease – skin disease that belongs to precancerous lesions (precancerous lesions). It is called intraepidermal carcinoma in situ and is considered a precursor of squamous cell carcinoma.
- Squamous cell carcinoma
Injuries, poisonings and other consequences of external causes (S00-T98).
- Chemical burn (“Aspirin Burn”).
- Burn
- Irritative-traumatic lesions