A<unk>  is a generally benign<unk>  that arises from the stratified<unk>  epithelium of the skin, lip, oral cavity, tongue, pharynx, larynx, esophagus, cervix, vagina or anal canal.<unk> s are typically associated with human<unk> virus (HPV) while sometimes the cause is unknown.
Squamous cell papilloma
Smokeless tobacco keratosis
Basal cell adenoma
Inverted papilloma
Hydrocarbon keratosis
Actinic keratosis
Lentiginosis
PUVA keratosis