Acatalasia (acatalasemia, Takaharas disease)
Acquired dyskeratotic leukoplakia
Actinic cheilitis (actinic cheilosis)
Acute necrotizing ulcerative gingivitis (acute membranous gingivitis, acute necrotizing ulcerative gingivostomatitis, fusospirillary gingivitis, fusospirillosis, fusospirochetal gingivitis, necrotizing gingivitis, phagedenic gingivitis, trench mouth, ulcerative gingivitis, Vincent gingivitis, Vincent infection, Vincent stomatitis, Vincents disease)
Allergic contact cheilitis
Angina bullosa haemorrhagica
Angular cheilitis (perlèche)
Behçets disease (Behçets syndrome, oculo-oral-genital syndrome)
Black hairy tongue (hairy tongue, lingua villosa nigra) 
Caviar tongue
Cheilitis exfoliativa
Cheilitis glandularis
Cheilitis granulomatosa (granulomatous cheilitis, orofacial granulomatosis)
Cutaneous sinus of dental origin (dental sinus)
Cyclic neutropenia
Desquamative gingivitis
Drug-induced ulcer of the lip
Epidermization of the lip
Epulis
Epulis fissuratum (granuloma fissuratum)
Eruptive lingual papillitis
Erythroplakia (erythroplasia)
Fissured tongue (furrowed tongue, lingua plicata, plicated tongue, scrotal tongue)
Geographic tongue (benign migratory glossitis, benign migratory stomatitis, glossitis areata exfoliativa, glossitis areata migrans, lingua geographica, stomatitis areata migrans, transitory benign plaques of the tongue)
Gingival fibroma
Gingival hypertrophy
Hairy leukoplakia (oral hairy leukoplakia)
Intraoral dental sinus
Linea alba
Leukoplakia
Leukoplakia with tylosis and esophageal carcinoma
Major aphthous ulcer (periadenitis mucosa necrotica recurrens)
Median rhomboid glossitis (central papillary atrophy)
Melanocytic oral lesion
Melkersson–Rosenthal syndrome
Morsicatio buccarum (chronic cheek biting, chronic cheek chewing)
Mucosal squamous cell carcinoma
Mucous cyst of the oral mucosa (mucocele)
Nagayamas spots
Oral Crohns disease
Oral florid papillomatosis
Oral melanosis
Osseous choristoma of the tongue
Peripheral ameloblastoma
Plasma cell cheilitis (plasma cell gingivitis, plasma cell orificial mucositi)
Plasmoacanthoma
Proliferative verrucous leukoplakia
Pyogenic granuloma (eruptive hemangioma, granulation tissue-type hemangioma, granuloma gravidarum, lobular capillary hemangioma, pregnancy tumor, tumor of pregnancy)  
Pyostomatitis vegetans
Recurrent aphthous stomatitis (aphthosis, canker sores, recurrent oral aphthae)
Recurrent intraoral herpes simplex infection
Smooth tongue (atrophic glossitis, bald tongue, hunter glossitis, moeller)
Stomatitis nicotina (nicotine stomatitis, smokers keratosis, smokers patches)
Torus palatinus
Trumpeters wart
Vestibular papillomatosis
White sponge nevus (white sponge nevus of Cannon)

Conditions of the skin appendages
Conditions of the skin appendages are those affecting the glands of the skin, hair, nails, and arrector pili muscles.
Nicotine poisoning describes the symptoms of the toxic effects of nicotine following ingestion, inhalation, or skin contact. Nicotine poisoning can potentially be deadly, though serious or fatal overdoses are rare. Historically, most cases of nicotine poisoning have been the result of use of nicotine as an insecticide. More recent cases of poisoning typically appear to be in the form of Green Tobacco Sickness, or due to unintended ingestion of tobacco or tobacco products or consumption of nicotine-containing plants.Standard textbooks, databases, and safety sheets consistently state that the lethal dose of nicotine for adults is 60 mg or less (30–60 mg), but there is overwhelming data indicating that more than 0.5 g of oral nicotine is required to kill an adult.Children may become ill following ingestion of one cigarette; ingestion of more than this may cause a child to become severely ill. The nicotine in the e-liquid of an electronic cigarette can be hazardous to infants and children, through accidental ingestion or skin contact. In some cases children have become poisoned by topical medicinal creams which contain nicotine.People who harvest or cultivate tobacco may experience Green Tobacco Sickness (GTS), a type of nicotine poisoning caused by skin contact with wet tobacco leaves. This occurs most commonly in young, inexperienced tobacco harvesters who do not consume tobacco. Signs and symptoms
Nicotine poisoning tends to produce symptoms that follow a biphasic pattern.