KeratosisKeratosis, ActinicKeratosis, SeborrheicDarier DiseaseFacial DermatosesBowen's DiseaseKeratoderma, PalmoplantarKeratoacanthomaPhotosensitivity DisordersEyebrowsSkin NeoplasmsCarcinoma, Basal CellLichenoid EruptionsLichen PlanusScalp DermatosesOintment BasesParakeratosisLeukoplakiaCarcinoma, Squamous CellKeratolytic AgentsSkin DiseasesSunlightPetrolatumLeukoplakia, OralArsenic PoisoningConjunctival DiseasesAcitretinSkin Diseases, GeneticIchthyosis VulgarisHyperpigmentationAminolevulinic AcidPrecancerous ConditionsDermatologic AgentsSkinMouth MucosaAminoquinolinesPhotochemotherapyOintmentsWartsMicroscopy, AcousticSkin PigmentationPhotosensitizing AgentsEpidermisKeratinocytesArsenicAdministration, TopicalUltraviolet RaysBiopsy