rel="nofollow" href="#ulink_d9bca844-8600-57f5-83d5-d36db7e32a3b">23.12 Oral Lichen Planus: Key Features 23.13 Oral Squamous Cell Carcinoma: Key Features 23.14 Pseudomembranous Candidosis: Key Features 23.15 Smokeless Tobacco‐Induced Keratosis: Key Features 23.16 Smoker's Keratosis: Key Features 23.17 Sublingual Keratosis: Key Features 23.18 Syphilitic Leukoplakia: Key Features 23.19 Verrucous Carcinoma: Key Features 23.20 White Hairy Tongue: Key Features 23.21 White Sponge Nevus: Key Features Recommended Reading 24 Red and Purple Lesions of the Oral Mucosa 24.1 Contact Stomatitis: Key Features 24.2 Desquamative Gingivitis: Key Features 24.3 Erythema Migrans: Key Features 24.4 Erythema Multiforme: Key Features 24.5 Erythematous Candidosis: Key Features 24.6 Erythroplakia: Key Features 24.7 Haemangioma: Key Features 24.8 Hereditary Haemorrhagic Telangiectasia: Key Features 24.9 Infectious Mononucleosis: Key Features 24.10 Kaposi's Sarcoma: Key Features 24.11 Linear Gingival Erythema: Key Features 24.12 Lupus Erythematosus: Key Features 24.13 Median Rhomboid Glossitis: Key Features 24.14 Mucosal Ecchymosis, Haematoma, and Petechiae: Key Features 24.15 Plasma Cell Gingivitis: Key Features 24.16 Port‐Wine Nevus: Key Features 24.17 Radiation Mucositis: Key Features 24.18 Thermal Burn: Key Features Recommended Reading 25 Blue, Black, and Brown Lesions of the Oral Mucosa 25.1 Addison's Disease: Key Features 25.2 Amalgam Tattoo: Key Features 25.3 Black/Brown Hairy Tongue: Key Features 25.4 Drug‐Induced Pigmentation: Key Features 25.5 Heavy Metal Pigmentation: Key Features 25.6 Laugier–Hunziker Syndrome: Key Features 25.7 Melanoma: Key Features 25.8 Melanotic Macule: Key Features 25.9 Peutz–Jeghers Syndrome: Key Features 25.10 Physiological Pigmentation: Key Features 25.11 Mucosal Nevi: Key Features 25.12 Smoker's Melanosis: Key Features Recommended Reading 26 Vesiculobullous Lesions of the Oral Mucosa 26.1 Angina Bullosa Haemorrhagica: Key Features 26.2 Bullous Lichen Planus: Key Features 26.3 Dermatitis Herpetiformis: Key Features 26.4 Erythema Multiforme: Key Features 26.5 Hand, Foot and Mouth Disease: Key Features 26.6 Herpes Zoster (Shingles): Key Features 26.7 Mucous Membrane Pemphigoid: Key Features 26.8 Pemphigus Vulgaris: Key Features 26.9 Primary Herpetic Gingivostomatitis: Key Features 26.10 Herpes Labialis: Key Features Recommended Reading 27 Ulcerative Lesions of the Oral Mucosa 27.1 Oral Ulcers in Agranulocytosis: Key Features 27.2 Oral Ulcers in Behçet’s Disease: Key Features 27.3 Oral Ulcers in Coeliac Disease: Key Features 27.4 Chronic Ulcerative Stomatitis: Key Features 27.5 Oral Ulcers in Crohn's Disease: Key Features 27.6 Oral Ulcers in Cyclic Neutropenia: Key Features 27.7 Cytomegalovirus Ulcers: Key Features 27.8 Eosinophilic Ulcer: Key Features 27.9 Gangrenous Stomatitis: Key Features 27.10 Necrotizing Sialometaplasia: Key Features 27.11 Necrotizing Ulcerative Gingivitis: Key Features 27.12 Oral Ulcers in Reactive Arthritis: Key Features 27.13 Recurrent Aphthous Ulcers: Key Features